diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index cb1b0ebf8db..176c06114e0 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1540,6 +1540,9 @@ note: if you're sure you want to do this, please open an issue as to why. In the
             }
         }
         cmd.env("RUSTC_BOOTSTRAP", "1");
+        // Override the rustc version used in symbol hashes to reduce the amount of normalization
+        // needed when diffing test output.
+        cmd.env("RUSTC_FORCE_RUSTC_VERSION", "compiletest");
         cmd.env("DOC_RUST_LANG_ORG_CHANNEL", builder.doc_rust_lang_org_channel());
         builder.add_rust_test_threads(&mut cmd);
 
diff --git a/src/test/mir-opt/const_promotion_extern_static.BAR.PromoteTemps.diff b/src/test/mir-opt/const_promotion_extern_static.BAR.PromoteTemps.diff
index 1e531365638..b480b257825 100644
--- a/src/test/mir-opt/const_promotion_extern_static.BAR.PromoteTemps.diff
+++ b/src/test/mir-opt/const_promotion_extern_static.BAR.PromoteTemps.diff
@@ -30,7 +30,7 @@
 -         _3 = [move _4];                  // scope 0 at $DIR/const-promotion-extern-static.rs:9:31: 9:35
 -         _2 = &_3;                        // scope 0 at $DIR/const-promotion-extern-static.rs:9:31: 9:44
 +                                          // + span: $DIR/const-promotion-extern-static.rs:9:31: 9:44
-+                                          // + literal: Const { ty: &[&i32; 1], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:6 ~ const_promotion_extern_static[HASH]::BAR), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
++                                          // + literal: Const { ty: &[&i32; 1], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:6 ~ const_promotion_extern_static[e01c]::BAR), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
 +         _2 = &(*_6);                     // scope 0 at $DIR/const-promotion-extern-static.rs:9:31: 9:44
           _1 = move _2 as &[&i32] (Pointer(Unsize)); // scope 0 at $DIR/const-promotion-extern-static.rs:9:31: 9:44
 -         StorageDead(_4);                 // scope 0 at $DIR/const-promotion-extern-static.rs:9:34: 9:35
diff --git a/src/test/mir-opt/const_promotion_extern_static.FOO.PromoteTemps.diff b/src/test/mir-opt/const_promotion_extern_static.FOO.PromoteTemps.diff
index a012285c7ec..ed48f5dc9dc 100644
--- a/src/test/mir-opt/const_promotion_extern_static.FOO.PromoteTemps.diff
+++ b/src/test/mir-opt/const_promotion_extern_static.FOO.PromoteTemps.diff
@@ -32,7 +32,7 @@
 -         _3 = [move _4];                  // scope 0 at $DIR/const-promotion-extern-static.rs:13:31: 13:46
 -         _2 = &_3;                        // scope 0 at $DIR/const-promotion-extern-static.rs:13:31: 13:55
 +                                          // + span: $DIR/const-promotion-extern-static.rs:13:31: 13:55
-+                                          // + literal: Const { ty: &[&i32; 1], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:7 ~ const_promotion_extern_static[HASH]::FOO), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
++                                          // + literal: Const { ty: &[&i32; 1], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:7 ~ const_promotion_extern_static[e01c]::FOO), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
 +         _2 = &(*_6);                     // scope 0 at $DIR/const-promotion-extern-static.rs:13:31: 13:55
           _1 = move _2 as &[&i32] (Pointer(Unsize)); // scope 0 at $DIR/const-promotion-extern-static.rs:13:31: 13:55
 -         StorageDead(_4);                 // scope 0 at $DIR/const-promotion-extern-static.rs:13:45: 13:46
diff --git a/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.32bit.diff b/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.32bit.diff
index 7627ed54623..553011f1aaa 100644
--- a/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.32bit.diff
+++ b/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.32bit.diff
@@ -31,7 +31,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
-                                           // + literal: Const { ty: &[i32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ bad_op_unsafe_oob_for_slices[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &[i32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ bad_op_unsafe_oob_for_slices[fbcf]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _3 = _9;                         // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
           _2 = &raw const (*_3);           // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
           _1 = move _2 as *const [i32] (Pointer(Unsize)); // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
diff --git a/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.64bit.diff b/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.64bit.diff
index 7627ed54623..553011f1aaa 100644
--- a/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.64bit.diff
+++ b/src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.main.ConstProp.64bit.diff
@@ -31,7 +31,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
-                                           // + literal: Const { ty: &[i32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ bad_op_unsafe_oob_for_slices[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &[i32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ bad_op_unsafe_oob_for_slices[fbcf]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _3 = _9;                         // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
           _2 = &raw const (*_3);           // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
           _1 = move _2 as *const [i32] (Pointer(Unsize)); // scope 0 at $DIR/bad_op_unsafe_oob_for_slices.rs:5:25: 5:35
diff --git a/src/test/mir-opt/const_prop/const_prop_fails_gracefully.main.ConstProp.diff b/src/test/mir-opt/const_prop/const_prop_fails_gracefully.main.ConstProp.diff
index e6220176778..44273b763be 100644
--- a/src/test/mir-opt/const_prop/const_prop_fails_gracefully.main.ConstProp.diff
+++ b/src/test/mir-opt/const_prop/const_prop_fails_gracefully.main.ConstProp.diff
@@ -22,7 +22,7 @@
                                            // + val: Unevaluated(FOO, [], None)
                                            // mir::Constant
                                            // + span: $DIR/const_prop_fails_gracefully.rs:7:13: 7:16
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:5 ~ const_prop_fails_gracefully[HASH]::main::FOO), const_param_did: None }, substs: [], promoted: None }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:5 ~ const_prop_fails_gracefully[809a]::main::FOO), const_param_did: None }, substs: [], promoted: None }) }
           _2 = &raw const (*_3);           // scope 0 at $DIR/const_prop_fails_gracefully.rs:7:13: 7:16
           _1 = move _2 as usize (Misc);    // scope 0 at $DIR/const_prop_fails_gracefully.rs:7:13: 7:39
           StorageDead(_2);                 // scope 0 at $DIR/const_prop_fails_gracefully.rs:7:38: 7:39
diff --git a/src/test/mir-opt/const_prop/ref_deref.main.ConstProp.diff b/src/test/mir-opt/const_prop/ref_deref.main.ConstProp.diff
index d602e12a370..2864e01d9dc 100644
--- a/src/test/mir-opt/const_prop/ref_deref.main.ConstProp.diff
+++ b/src/test/mir-opt/const_prop/ref_deref.main.ConstProp.diff
@@ -17,7 +17,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/ref_deref.rs:5:6: 5:10
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref[d561]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _2 = _4;                         // scope 0 at $DIR/ref_deref.rs:5:6: 5:10
 -         _1 = (*_2);                      // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
 +         _1 = const 4_i32;                // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
diff --git a/src/test/mir-opt/const_prop/ref_deref.main.PromoteTemps.diff b/src/test/mir-opt/const_prop/ref_deref.main.PromoteTemps.diff
index 35916d90e56..5a678616f63 100644
--- a/src/test/mir-opt/const_prop/ref_deref.main.PromoteTemps.diff
+++ b/src/test/mir-opt/const_prop/ref_deref.main.PromoteTemps.diff
@@ -20,7 +20,7 @@
 +                                          // + val: Unevaluated(main, [], Some(promoted[0]))
 +                                          // mir::Constant
 +                                          // + span: $DIR/ref_deref.rs:5:6: 5:10
-+                                          // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
++                                          // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref[d561]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
 +         _2 = &(*_4);                     // scope 0 at $DIR/ref_deref.rs:5:6: 5:10
           _1 = (*_2);                      // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
 -         StorageDead(_3);                 // scope 0 at $DIR/ref_deref.rs:5:10: 5:11
diff --git a/src/test/mir-opt/const_prop/ref_deref_project.main.ConstProp.diff b/src/test/mir-opt/const_prop/ref_deref_project.main.ConstProp.diff
index 39651884e77..53f9daa09da 100644
--- a/src/test/mir-opt/const_prop/ref_deref_project.main.ConstProp.diff
+++ b/src/test/mir-opt/const_prop/ref_deref_project.main.ConstProp.diff
@@ -17,7 +17,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/ref_deref_project.rs:5:6: 5:17
-                                           // + literal: Const { ty: &(i32, i32), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref_project[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &(i32, i32), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref_project[d1f7]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _2 = &((*_4).1: i32);            // scope 0 at $DIR/ref_deref_project.rs:5:6: 5:17
           _1 = (*_2);                      // scope 0 at $DIR/ref_deref_project.rs:5:5: 5:17
           StorageDead(_2);                 // scope 0 at $DIR/ref_deref_project.rs:5:17: 5:18
diff --git a/src/test/mir-opt/const_prop/ref_deref_project.main.PromoteTemps.diff b/src/test/mir-opt/const_prop/ref_deref_project.main.PromoteTemps.diff
index 501d7205679..d5235a1d025 100644
--- a/src/test/mir-opt/const_prop/ref_deref_project.main.PromoteTemps.diff
+++ b/src/test/mir-opt/const_prop/ref_deref_project.main.PromoteTemps.diff
@@ -20,7 +20,7 @@
 +                                          // + val: Unevaluated(main, [], Some(promoted[0]))
 +                                          // mir::Constant
 +                                          // + span: $DIR/ref_deref_project.rs:5:6: 5:17
-+                                          // + literal: Const { ty: &(i32, i32), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref_project[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
++                                          // + literal: Const { ty: &(i32, i32), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref_project[d1f7]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
 +         _2 = &((*_4).1: i32);            // scope 0 at $DIR/ref_deref_project.rs:5:6: 5:17
           _1 = (*_2);                      // scope 0 at $DIR/ref_deref_project.rs:5:5: 5:17
 -         StorageDead(_3);                 // scope 0 at $DIR/ref_deref_project.rs:5:17: 5:18
diff --git a/src/test/mir-opt/const_prop/slice_len.main.ConstProp.32bit.diff b/src/test/mir-opt/const_prop/slice_len.main.ConstProp.32bit.diff
index 6a580278d5f..339c3d13b8d 100644
--- a/src/test/mir-opt/const_prop/slice_len.main.ConstProp.32bit.diff
+++ b/src/test/mir-opt/const_prop/slice_len.main.ConstProp.32bit.diff
@@ -25,7 +25,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/slice_len.rs:5:6: 5:19
-                                           // + literal: Const { ty: &[u32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ slice_len[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &[u32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ slice_len[7261]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _4 = _9;                         // scope 0 at $DIR/slice_len.rs:5:6: 5:19
           _3 = _4;                         // scope 0 at $DIR/slice_len.rs:5:6: 5:19
           StorageLive(_10);                // scope 0 at $DIR/slice_len.rs:5:6: 5:19
diff --git a/src/test/mir-opt/const_prop/slice_len.main.ConstProp.64bit.diff b/src/test/mir-opt/const_prop/slice_len.main.ConstProp.64bit.diff
index 6a580278d5f..339c3d13b8d 100644
--- a/src/test/mir-opt/const_prop/slice_len.main.ConstProp.64bit.diff
+++ b/src/test/mir-opt/const_prop/slice_len.main.ConstProp.64bit.diff
@@ -25,7 +25,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/slice_len.rs:5:6: 5:19
-                                           // + literal: Const { ty: &[u32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ slice_len[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &[u32; 3], val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ slice_len[7261]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _4 = _9;                         // scope 0 at $DIR/slice_len.rs:5:6: 5:19
           _3 = _4;                         // scope 0 at $DIR/slice_len.rs:5:6: 5:19
           StorageLive(_10);                // scope 0 at $DIR/slice_len.rs:5:6: 5:19
diff --git a/src/test/mir-opt/inline/inline_retag.bar.Inline.after.mir b/src/test/mir-opt/inline/inline_retag.bar.Inline.after.mir
index 486fc7541c3..5e3ec0889e9 100644
--- a/src/test/mir-opt/inline/inline_retag.bar.Inline.after.mir
+++ b/src/test/mir-opt/inline/inline_retag.bar.Inline.after.mir
@@ -38,7 +38,7 @@ fn bar() -> bool {
                                          // + val: Unevaluated(bar, [], Some(promoted[1]))
                                          // mir::Constant
                                          // + span: $DIR/inline-retag.rs:12:7: 12:9
-                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:4 ~ inline_retag[HASH]::bar), const_param_did: None }, substs: [], promoted: Some(promoted[1]) }) }
+                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:4 ~ inline_retag[86d7]::bar), const_param_did: None }, substs: [], promoted: Some(promoted[1]) }) }
         Retag(_10);                      // scope 1 at $DIR/inline-retag.rs:12:7: 12:9
         _4 = &(*_10);                    // scope 1 at $DIR/inline-retag.rs:12:7: 12:9
         Retag(_4);                       // scope 1 at $DIR/inline-retag.rs:12:7: 12:9
@@ -52,7 +52,7 @@ fn bar() -> bool {
                                          // + val: Unevaluated(bar, [], Some(promoted[0]))
                                          // mir::Constant
                                          // + span: $DIR/inline-retag.rs:12:11: 12:14
-                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:4 ~ inline_retag[HASH]::bar), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:4 ~ inline_retag[86d7]::bar), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
         Retag(_9);                       // scope 1 at $DIR/inline-retag.rs:12:11: 12:14
         _7 = &(*_9);                     // scope 1 at $DIR/inline-retag.rs:12:11: 12:14
         Retag(_7);                       // scope 1 at $DIR/inline-retag.rs:12:11: 12:14
diff --git a/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff b/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
index 7938c0a23e8..016e0cb5901 100644
--- a/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
+++ b/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
@@ -66,7 +66,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[9565]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _8 = _20;                        // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_6.0: &i32) = move _7;          // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_6.1: &i32) = move _8;          // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
diff --git a/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff b/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
index 7938c0a23e8..016e0cb5901 100644
--- a/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
+++ b/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
@@ -66,7 +66,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[9565]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _8 = _20;                        // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_6.0: &i32) = move _7;          // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_6.1: &i32) = move _8;          // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
diff --git a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
index 20771bf4231..59daeb1e997 100644
--- a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
+++ b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
@@ -87,7 +87,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[9565]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _11 = _28;                       // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_9.0: &i32) = move _10;         // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_9.1: &i32) = move _11;         // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
diff --git a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
index 20771bf4231..59daeb1e997 100644
--- a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
+++ b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
@@ -87,7 +87,7 @@
                                            // + val: Unevaluated(main, [], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ issue_73223[9565]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
           _11 = _28;                       // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_9.0: &i32) = move _10;         // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
           (_9.1: &i32) = move _11;         // scope 3 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
diff --git a/src/test/mir-opt/lower_intrinsics.discriminant.LowerIntrinsics.diff b/src/test/mir-opt/lower_intrinsics.discriminant.LowerIntrinsics.diff
index 75d0e75f5b1..644a5593a9d 100644
--- a/src/test/mir-opt/lower_intrinsics.discriminant.LowerIntrinsics.diff
+++ b/src/test/mir-opt/lower_intrinsics.discriminant.LowerIntrinsics.diff
@@ -50,7 +50,7 @@
                                            // + val: Unevaluated(discriminant, [T], Some(promoted[2]))
                                            // mir::Constant
                                            // + span: $DIR/lower_intrinsics.rs:75:42: 75:44
-                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[HASH]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[2]) }) }
+                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[49eb]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[2]) }) }
           _7 = &(*_19);                    // scope 0 at $DIR/lower_intrinsics.rs:75:42: 75:44
           _6 = &(*_7);                     // scope 0 at $DIR/lower_intrinsics.rs:75:42: 75:44
 -         _5 = discriminant_value::<i32>(move _6) -> bb2; // scope 0 at $DIR/lower_intrinsics.rs:75:5: 75:45
@@ -74,7 +74,7 @@
                                            // + val: Unevaluated(discriminant, [T], Some(promoted[1]))
                                            // mir::Constant
                                            // + span: $DIR/lower_intrinsics.rs:76:42: 76:45
-                                           // + literal: Const { ty: &(), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[HASH]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[1]) }) }
+                                           // + literal: Const { ty: &(), val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[49eb]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[1]) }) }
           _11 = &(*_18);                   // scope 0 at $DIR/lower_intrinsics.rs:76:42: 76:45
           _10 = &(*_11);                   // scope 0 at $DIR/lower_intrinsics.rs:76:42: 76:45
 -         _9 = discriminant_value::<()>(move _10) -> bb3; // scope 0 at $DIR/lower_intrinsics.rs:76:5: 76:46
@@ -98,7 +98,7 @@
                                            // + val: Unevaluated(discriminant, [T], Some(promoted[0]))
                                            // mir::Constant
                                            // + span: $DIR/lower_intrinsics.rs:77:42: 77:47
-                                           // + literal: Const { ty: &E, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[HASH]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[0]) }) }
+                                           // + literal: Const { ty: &E, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:29 ~ lower_intrinsics[49eb]::discriminant), const_param_did: None }, substs: [T], promoted: Some(promoted[0]) }) }
           _15 = &(*_17);                   // scope 0 at $DIR/lower_intrinsics.rs:77:42: 77:47
           _14 = &(*_15);                   // scope 0 at $DIR/lower_intrinsics.rs:77:42: 77:47
 -         _13 = discriminant_value::<E>(move _14) -> bb4; // scope 0 at $DIR/lower_intrinsics.rs:77:5: 77:48
diff --git a/src/test/mir-opt/match_false_edges.full_tested_match.PromoteTemps.after.mir b/src/test/mir-opt/match_false_edges.full_tested_match.PromoteTemps.after.mir
index 51425af4bdf..b3a9365396c 100644
--- a/src/test/mir-opt/match_false_edges.full_tested_match.PromoteTemps.after.mir
+++ b/src/test/mir-opt/match_false_edges.full_tested_match.PromoteTemps.after.mir
@@ -57,7 +57,7 @@ fn full_tested_match() -> () {
                                          // + val: Unevaluated(full_tested_match, [], Some(promoted[0]))
                                          // mir::Constant
                                          // + span: $DIR/match_false_edges.rs:16:14: 16:15
-                                         // + literal: Const { ty: &std::option::Option<i32>, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:5 ~ match_false_edges[HASH]::full_tested_match), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                         // + literal: Const { ty: &std::option::Option<i32>, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:5 ~ match_false_edges[5411]::full_tested_match), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
         _6 = &(((*_11) as Some).0: i32); // scope 0 at $DIR/match_false_edges.rs:16:14: 16:15
         _4 = &shallow _2;                // scope 0 at $DIR/match_false_edges.rs:15:19: 15:27
         StorageLive(_7);                 // scope 0 at $DIR/match_false_edges.rs:16:20: 16:27
diff --git a/src/test/mir-opt/retag.array_casts.SimplifyCfg-elaborate-drops.after.mir b/src/test/mir-opt/retag.array_casts.SimplifyCfg-elaborate-drops.after.mir
index 1db36c352ff..54d836ba609 100644
--- a/src/test/mir-opt/retag.array_casts.SimplifyCfg-elaborate-drops.after.mir
+++ b/src/test/mir-opt/retag.array_casts.SimplifyCfg-elaborate-drops.after.mir
@@ -127,7 +127,7 @@ fn array_casts() -> () {
                                          // + val: Unevaluated(array_casts, [], Some(promoted[0]))
                                          // mir::Constant
                                          // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
-                                         // + literal: Const { ty: &usize, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:15 ~ retag[HASH]::array_casts), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                         // + literal: Const { ty: &usize, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:15 ~ retag[4622]::array_casts), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
         Retag(_35);                      // scope 5 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
         _18 = &(*_35);                   // scope 5 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
         Retag(_18);                      // scope 5 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
diff --git a/src/test/mir-opt/retag.main.SimplifyCfg-elaborate-drops.after.mir b/src/test/mir-opt/retag.main.SimplifyCfg-elaborate-drops.after.mir
index cffe7238987..29a72feed7d 100644
--- a/src/test/mir-opt/retag.main.SimplifyCfg-elaborate-drops.after.mir
+++ b/src/test/mir-opt/retag.main.SimplifyCfg-elaborate-drops.after.mir
@@ -113,7 +113,7 @@ fn main() -> () {
         StorageLive(_14);                // scope 1 at $DIR/retag.rs:40:31: 43:6
         _14 = [closure@main::{closure#0}]; // scope 1 at $DIR/retag.rs:40:31: 43:6
                                          // closure
-                                         // + def_id: DefId(0:14 ~ retag[HASH]::main::{closure#0})
+                                         // + def_id: DefId(0:14 ~ retag[4622]::main::{closure#0})
                                          // + substs: [
                                          //     i8,
                                          //     for<'r> extern "rust-call" fn((&'r i32,)) -> &'r i32,
@@ -153,7 +153,7 @@ fn main() -> () {
                                          // + val: Unevaluated(main, [], Some(promoted[0]))
                                          // mir::Constant
                                          // + span: $DIR/retag.rs:47:21: 47:23
-                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:13 ~ retag[HASH]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
+                                         // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:13 ~ retag[4622]::main), const_param_did: None }, substs: [], promoted: Some(promoted[0]) }) }
         Retag(_28);                      // scope 7 at $DIR/retag.rs:47:21: 47:23
         _23 = &(*_28);                   // scope 7 at $DIR/retag.rs:47:21: 47:23
         Retag(_23);                      // scope 7 at $DIR/retag.rs:47:21: 47:23
diff --git a/src/test/ui/consts/miri_unleashed/tls.stderr b/src/test/ui/consts/miri_unleashed/tls.stderr
index ebe20348830..a49e50a3eaa 100644
--- a/src/test/ui/consts/miri_unleashed/tls.stderr
+++ b/src/test/ui/consts/miri_unleashed/tls.stderr
@@ -2,13 +2,13 @@ error[E0080]: could not evaluate static initializer
   --> $DIR/tls.rs:12:25
    |
 LL |     unsafe { let _val = A; }
-   |                         ^ cannot access thread local static (DefId(0:6 ~ tls[HASH]::A))
+   |                         ^ cannot access thread local static (DefId(0:6 ~ tls[78b0]::A))
 
 error[E0080]: could not evaluate static initializer
   --> $DIR/tls.rs:19:26
    |
 LL |     unsafe { let _val = &A; }
-   |                          ^ cannot access thread local static (DefId(0:6 ~ tls[HASH]::A))
+   |                          ^ cannot access thread local static (DefId(0:6 ~ tls[78b0]::A))
 
 warning: skipping const checks
    |
diff --git a/src/test/ui/generator/print/generator-print-verbose-1.stderr b/src/test/ui/generator/print/generator-print-verbose-1.stderr
index 2b9bcb1bf8a..2f7faf520d9 100644
--- a/src/test/ui/generator/print/generator-print-verbose-1.stderr
+++ b/src/test/ui/generator/print/generator-print-verbose-1.stderr
@@ -9,7 +9,7 @@ note: generator is not `Send` as this value is used across a yield
   --> $DIR/generator-print-verbose-1.rs:35:9
    |
 LL |         let _non_send_gen = make_non_send_generator();
-   |             ------------- has type `Opaque(DefId(0:34 ~ generator_print_verbose_1[HASH]::make_non_send_generator::{opaque#0}), [])` which is not `Send`
+   |             ------------- has type `Opaque(DefId(0:34 ~ generator_print_verbose_1[749a]::make_non_send_generator::{opaque#0}), [])` which is not `Send`
 LL |         yield;
    |         ^^^^^ yield occurs here, with `_non_send_gen` maybe used later
 LL |     };
@@ -29,10 +29,10 @@ LL |     require_send(send_gen);
    = help: the trait `Sync` is not implemented for `RefCell<i32>`
    = note: required because of the requirements on the impl of `Send` for `Arc<RefCell<i32>>`
    = note: required because it appears within the type `[make_gen2<Arc<RefCell<i32>>>::{closure#0} upvar_tys=(Arc<RefCell<i32>>) {()}]`
-   = note: required because it appears within the type `Opaque(DefId(0:39 ~ generator_print_verbose_1[HASH]::make_gen2::{opaque#0}), [std::sync::Arc<std::cell::RefCell<i32>>])`
-   = note: required because it appears within the type `Opaque(DefId(0:42 ~ generator_print_verbose_1[HASH]::make_non_send_generator2::{opaque#0}), [])`
-   = note: required because it appears within the type `{Opaque(DefId(0:42 ~ generator_print_verbose_1[HASH]::make_non_send_generator2::{opaque#0}), []), ()}`
-   = note: required because it appears within the type `[test2::{closure#0} upvar_tys=() {Opaque(DefId(0:42 ~ generator_print_verbose_1[HASH]::make_non_send_generator2::{opaque#0}), []), ()}]`
+   = note: required because it appears within the type `Opaque(DefId(0:39 ~ generator_print_verbose_1[749a]::make_gen2::{opaque#0}), [std::sync::Arc<std::cell::RefCell<i32>>])`
+   = note: required because it appears within the type `Opaque(DefId(0:42 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), [])`
+   = note: required because it appears within the type `{Opaque(DefId(0:42 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), []), ()}`
+   = note: required because it appears within the type `[test2::{closure#0} upvar_tys=() {Opaque(DefId(0:42 ~ generator_print_verbose_1[749a]::make_non_send_generator2::{opaque#0}), []), ()}]`
 note: required by a bound in `require_send`
   --> $DIR/generator-print-verbose-1.rs:26:25
    |
diff --git a/src/test/ui/nll/ty-outlives/impl-trait-captures.stderr b/src/test/ui/nll/ty-outlives/impl-trait-captures.stderr
index 5e56e12eda0..3e6fe789a8b 100644
--- a/src/test/ui/nll/ty-outlives/impl-trait-captures.stderr
+++ b/src/test/ui/nll/ty-outlives/impl-trait-captures.stderr
@@ -4,11 +4,11 @@ error[E0700]: hidden type for `impl Trait` captures lifetime that does not appea
 LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> {
    |                  --     ^^^^^^^^^^^^
    |                  |
-   |                  hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[HASH]::foo), BrAnon(0)) T` captures the anonymous lifetime defined here
+   |                  hidden type `&ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0)) T` captures the anonymous lifetime defined here
    |
-help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[HASH]::foo), BrAnon(0))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[HASH]::foo), BrAnon(0))` lifetime bound
+help: to declare that the `impl Trait` captures `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0))`, you can add an explicit `ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0))` lifetime bound
    |
-LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[HASH]::foo), BrAnon(0)) {
+LL | fn foo<'a, T>(x: &T) -> impl Foo<'a> + ReFree(DefId(0:8 ~ impl_trait_captures[1afc]::foo), BrAnon(0)) {
    |                                      ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 error: aborting due to previous error
diff --git a/src/test/ui/specialization/min_specialization/repeated_projection_type.stderr b/src/test/ui/specialization/min_specialization/repeated_projection_type.stderr
index ad51707070f..1a7eb82c95b 100644
--- a/src/test/ui/specialization/min_specialization/repeated_projection_type.stderr
+++ b/src/test/ui/specialization/min_specialization/repeated_projection_type.stderr
@@ -1,4 +1,4 @@
-error: cannot specialize on `Binder(ProjectionPredicate(ProjectionTy { substs: [V], item_def_id: DefId(0:6 ~ repeated_projection_type[HASH]::Id::This) }, Ty((I,))), [])`
+error: cannot specialize on `Binder(ProjectionPredicate(ProjectionTy { substs: [V], item_def_id: DefId(0:6 ~ repeated_projection_type[54ea]::Id::This) }, Ty((I,))), [])`
   --> $DIR/repeated_projection_type.rs:19:1
    |
 LL | / impl<I, V: Id<This = (I,)>> X for V {
diff --git a/src/test/ui/symbol-names/basic.legacy.stderr b/src/test/ui/symbol-names/basic.legacy.stderr
index e0e798dac40..41f8ecf4ba7 100644
--- a/src/test/ui/symbol-names/basic.legacy.stderr
+++ b/src/test/ui/symbol-names/basic.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN5basic4main17h<SYMBOL_HASH>)
+error: symbol-name(_ZN5basic4main17h13492e1c4157543fE)
   --> $DIR/basic.rs:8:1
    |
 LL | #[rustc_symbol_name]
    | ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(basic::main::h<SYMBOL_HASH>)
+error: demangling(basic::main::h13492e1c4157543f)
   --> $DIR/basic.rs:8:1
    |
 LL | #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/basic.v0.stderr b/src/test/ui/symbol-names/basic.v0.stderr
index 27308fc5ec3..1f02781364e 100644
--- a/src/test/ui/symbol-names/basic.v0.stderr
+++ b/src/test/ui/symbol-names/basic.v0.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RNvCsCRATE_HASH_5basic4main)
 LL | #[rustc_symbol_name]
    | ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(basic[HASH]::main)
+error: demangling(basic[b751b4a00e2291d9]::main)
   --> $DIR/basic.rs:8:1
    |
 LL | #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/foreign-types.stderr b/src/test/ui/symbol-names/foreign-types.stderr
index fcffdd2a8ec..d6ee388ddf8 100644
--- a/src/test/ui/symbol-names/foreign-types.stderr
+++ b/src/test/ui/symbol-names/foreign-types.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RMCsCRATE_HASH_13foreign_typesINtB<REF>_5CheckNvB<REF>_11For
 LL | #[rustc_symbol_name]
    | ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<foreign_types[HASH]::Check<foreign_types[HASH]::ForeignType>>)
+error: demangling(<foreign_types[49eeeb51f120b431]::Check<foreign_types[49eeeb51f120b431]::ForeignType>>)
   --> $DIR/foreign-types.rs:13:1
    |
 LL | #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/impl1.legacy.stderr b/src/test/ui/symbol-names/impl1.legacy.stderr
index b17a073ee49..b6012e41594 100644
--- a/src/test/ui/symbol-names/impl1.legacy.stderr
+++ b/src/test/ui/symbol-names/impl1.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN5impl13foo3Foo3bar17h<SYMBOL_HASH>)
+error: symbol-name(_ZN5impl13foo3Foo3bar17<SYMBOL_HASH>)
   --> $DIR/impl1.rs:14:9
    |
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(impl1::foo::Foo::bar::h<SYMBOL_HASH>)
+error: demangling(impl1::foo::Foo::bar::<SYMBOL_HASH>)
   --> $DIR/impl1.rs:14:9
    |
 LL |         #[rustc_symbol_name]
@@ -22,13 +22,13 @@ error: def-path(foo::Foo::bar)
 LL |         #[rustc_def_path]
    |         ^^^^^^^^^^^^^^^^^
 
-error: symbol-name(_ZN5impl13bar33_$LT$impl$u20$impl1..foo..Foo$GT$3baz17h<SYMBOL_HASH>)
+error: symbol-name(_ZN5impl13bar33_$LT$impl$u20$impl1..foo..Foo$GT$3baz17<SYMBOL_HASH>)
   --> $DIR/impl1.rs:32:9
    |
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(impl1::bar::<impl impl1::foo::Foo>::baz::h<SYMBOL_HASH>)
+error: demangling(impl1::bar::<impl impl1::foo::Foo>::baz::<SYMBOL_HASH>)
   --> $DIR/impl1.rs:32:9
    |
 LL |         #[rustc_symbol_name]
@@ -46,13 +46,13 @@ error: def-path(bar::<impl foo::Foo>::baz)
 LL |         #[rustc_def_path]
    |         ^^^^^^^^^^^^^^^^^
 
-error: symbol-name(_ZN209_$LT$$u5b$$RF$dyn$u20$impl1..Foo$u2b$Assoc$u20$$u3d$$u20$extern$u20$$u22$C$u22$$u20$fn$LP$$RF$u8$C$$u20$...$RP$$u2b$impl1..AutoTrait$u3b$$u20$3$u5d$$u20$as$u20$impl1..main..$u7b$$u7b$closure$u7d$$u7d$..Bar$GT$6method17h<SYMBOL_HASH>)
+error: symbol-name(_ZN209_$LT$$u5b$$RF$dyn$u20$impl1..Foo$u2b$Assoc$u20$$u3d$$u20$extern$u20$$u22$C$u22$$u20$fn$LP$$RF$u8$C$$u20$...$RP$$u2b$impl1..AutoTrait$u3b$$u20$3$u5d$$u20$as$u20$impl1..main..$u7b$$u7b$closure$u7d$$u7d$..Bar$GT$6method17<SYMBOL_HASH>)
   --> $DIR/impl1.rs:62:13
    |
 LL |             #[rustc_symbol_name]
    |             ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<[&dyn impl1::Foo+Assoc = extern "C" fn(&u8, ::.)+impl1::AutoTrait; 3] as impl1::main::{{closure}}::Bar>::method::h<SYMBOL_HASH>)
+error: demangling(<[&dyn impl1::Foo+Assoc = extern "C" fn(&u8, ::.)+impl1::AutoTrait; 3] as impl1::main::{{closure}}::Bar>::method::<SYMBOL_HASH>)
   --> $DIR/impl1.rs:62:13
    |
 LL |             #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/impl1.v0.stderr b/src/test/ui/symbol-names/impl1.v0.stderr
index 06778e57fb1..48f7473b6a0 100644
--- a/src/test/ui/symbol-names/impl1.v0.stderr
+++ b/src/test/ui/symbol-names/impl1.v0.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RNvMNtCsCRATE_HASH_5impl13fooNtB<REF>_3Foo3bar)
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<impl1[HASH]::foo::Foo>::bar)
+error: demangling(<impl1[2c09c4f1c7c8e90c]::foo::Foo>::bar)
   --> $DIR/impl1.rs:14:9
    |
 LL |         #[rustc_symbol_name]
@@ -28,7 +28,7 @@ error: symbol-name(_RNvMNtCsCRATE_HASH_5impl13barNtNtB<REF>_3foo3Foo3baz)
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<impl1[HASH]::foo::Foo>::baz)
+error: demangling(<impl1[2c09c4f1c7c8e90c]::foo::Foo>::baz)
   --> $DIR/impl1.rs:32:9
    |
 LL |         #[rustc_symbol_name]
@@ -52,7 +52,7 @@ error: symbol-name(_RNvXNCNvCsCRATE_HASH_5impl14mains_0ARDNtB<REF>_3Foop5AssocFG
 LL |             #[rustc_symbol_name]
    |             ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<[&dyn impl1[HASH]::Foo<Assoc = for<'a> extern "C" fn(&'a u8, ...)> + impl1[HASH]::AutoTrait; 3usize] as impl1[HASH]::main::{closure#1}::Bar>::method)
+error: demangling(<[&dyn impl1[2c09c4f1c7c8e90c]::Foo<Assoc = for<'a> extern "C" fn(&'a u8, ...)> + impl1[2c09c4f1c7c8e90c]::AutoTrait; 3usize] as impl1[2c09c4f1c7c8e90c]::main::{closure#1}::Bar>::method)
   --> $DIR/impl1.rs:62:13
    |
 LL |             #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/issue-60925.legacy.stderr b/src/test/ui/symbol-names/issue-60925.legacy.stderr
index 46cb84e57bf..d26e71842f9 100644
--- a/src/test/ui/symbol-names/issue-60925.legacy.stderr
+++ b/src/test/ui/symbol-names/issue-60925.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h<SYMBOL_HASH>)
+error: symbol-name(_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17hd250581ce0d79d13E)
   --> $DIR/issue-60925.rs:21:9
    |
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo::h<SYMBOL_HASH>)
+error: demangling(issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo::hd250581ce0d79d13)
   --> $DIR/issue-60925.rs:21:9
    |
 LL |         #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/issue-60925.v0.stderr b/src/test/ui/symbol-names/issue-60925.v0.stderr
index 1cddba92085..408c957c6a1 100644
--- a/src/test/ui/symbol-names/issue-60925.v0.stderr
+++ b/src/test/ui/symbol-names/issue-60925.v0.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RNvMNtCsCRATE_HASH_11issue_609253fooINtB<REF>_3FooNtNtB<REF>
 LL |         #[rustc_symbol_name]
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<issue_60925[HASH]::foo::Foo<issue_60925[HASH]::llvm::Foo>>::foo)
+error: demangling(<issue_60925[775bc577f14ef671]::foo::Foo<issue_60925[775bc577f14ef671]::llvm::Foo>>::foo)
   --> $DIR/issue-60925.rs:21:9
    |
 LL |         #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/issue-75326.legacy.stderr b/src/test/ui/symbol-names/issue-75326.legacy.stderr
index 74e481badb0..aadc0cf43a2 100644
--- a/src/test/ui/symbol-names/issue-75326.legacy.stderr
+++ b/src/test/ui/symbol-names/issue-75326.legacy.stderr
@@ -1,10 +1,10 @@
-error: symbol-name(_ZN72_$LT$issue_75326..Foo$LT$I$C$E$GT$$u20$as$u20$issue_75326..Iterator2$GT$4next17h<SYMBOL_HASH>)
+error: symbol-name(_ZN72_$LT$issue_75326..Foo$LT$I$C$E$GT$$u20$as$u20$issue_75326..Iterator2$GT$4next17SYMBOL_HASH)
   --> $DIR/issue-75326.rs:41:5
    |
 LL |     #[rustc_symbol_name]
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next::h<SYMBOL_HASH>)
+error: demangling(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next::SYMBOL_HASH)
   --> $DIR/issue-75326.rs:41:5
    |
 LL |     #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/issue-75326.v0.stderr b/src/test/ui/symbol-names/issue-75326.v0.stderr
index 446fb8d6cf6..3d7803a0c3b 100644
--- a/src/test/ui/symbol-names/issue-75326.v0.stderr
+++ b/src/test/ui/symbol-names/issue-75326.v0.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RNvXINICsCRATE_HASH_11issue_75326s_0pppEINtB<REF>_3FooppENtB
 LL |     #[rustc_symbol_name]
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<issue_75326[HASH]::Foo<_, _> as issue_75326[HASH]::Iterator2>::next)
+error: demangling(<issue_75326[e8e253d78520f2a2]::Foo<_, _> as issue_75326[e8e253d78520f2a2]::Iterator2>::next)
   --> $DIR/issue-75326.rs:41:5
    |
 LL |     #[rustc_symbol_name]
diff --git a/src/test/ui/symbol-names/trait-objects.v0.stderr b/src/test/ui/symbol-names/trait-objects.v0.stderr
index 6c5e55ed2ae..47192ce5b83 100644
--- a/src/test/ui/symbol-names/trait-objects.v0.stderr
+++ b/src/test/ui/symbol-names/trait-objects.v0.stderr
@@ -4,7 +4,7 @@ error: symbol-name(_RNvXCsCRATE_HASH_13trait_objectsRDG_INtNtNtCsCRATE_HASH_4cor
 LL |     #[rustc_symbol_name]
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> as trait_objects[HASH]::Bar>::method)
+error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> as trait_objects[7260a56bea9f357b]::Bar>::method)
   --> $DIR/trait-objects.rs:15:5
    |
 LL |     #[rustc_symbol_name]
@@ -22,7 +22,7 @@ error: symbol-name(_RNvXs_CsCRATE_HASH_13trait_objectsRDG_INtNtNtCsCRATE_HASH_4c
 LL |     #[rustc_symbol_name]
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> + core[HASH]::marker::Send as trait_objects[HASH]::Foo>::method)
+error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> + core[HASH]::marker::Send as trait_objects[7260a56bea9f357b]::Foo>::method)
   --> $DIR/trait-objects.rs:27:5
    |
 LL |     #[rustc_symbol_name]
@@ -40,7 +40,7 @@ error: symbol-name(_RNvXs0_CsCRATE_HASH_13trait_objectsRDG_INtNtNtCsCRATE_HASH_4
 LL |     #[rustc_symbol_name]
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> + core[HASH]::marker::Send as trait_objects[HASH]::Baz>::method)
+error: demangling(<&dyn for<'a> core[HASH]::ops::function::FnMut<(&'a u8,), Output = ()> + core[HASH]::marker::Send as trait_objects[7260a56bea9f357b]::Baz>::method)
   --> $DIR/trait-objects.rs:39:5
    |
 LL |     #[rustc_symbol_name]
diff --git a/src/test/ui/thir-tree.stdout b/src/test/ui/thir-tree.stdout
index a732eb68a2b..3c84be8e8f8 100644
--- a/src/test/ui/thir-tree.stdout
+++ b/src/test/ui/thir-tree.stdout
@@ -1,4 +1,4 @@
-DefId(0:3 ~ thir_tree[HASH]::main):
+DefId(0:3 ~ thir_tree[8f1d]::main):
 Thir {
     arms: [],
     exprs: [
@@ -30,7 +30,7 @@ Thir {
                 region_scope: Node(2),
                 lint_level: Explicit(
                     HirId {
-                        owner: DefId(0:3 ~ thir_tree[HASH]::main),
+                        owner: DefId(0:3 ~ thir_tree[8f1d]::main),
                         local_id: 2,
                     },
                 ),
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 22785013085..00221b07f74 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -3498,10 +3498,12 @@ impl<'test> TestCx<'test> {
         // with placeholders as we do not want tests needing updated when compiler source code
         // changes.
         // eg. $SRC_DIR/libcore/mem.rs:323:14 becomes $SRC_DIR/libcore/mem.rs:LL:COL
-        normalized = Regex::new("SRC_DIR(.+):\\d+:\\d+(: \\d+:\\d+)?")
-            .unwrap()
-            .replace_all(&normalized, "SRC_DIR$1:LL:COL")
-            .into_owned();
+        lazy_static! {
+            static ref SRC_DIR_RE: Regex =
+                Regex::new("SRC_DIR(.+):\\d+:\\d+(: \\d+:\\d+)?").unwrap();
+        }
+
+        normalized = SRC_DIR_RE.replace_all(&normalized, "SRC_DIR$1:LL:COL").into_owned();
 
         normalized = Self::normalize_platform_differences(&normalized);
         normalized = normalized.replace("\t", "\\t"); // makes tabs visible
@@ -3510,73 +3512,38 @@ impl<'test> TestCx<'test> {
         // since they duplicate actual errors and make the output hard to read.
         // This mirrors the regex in src/tools/tidy/src/style.rs, please update
         // both if either are changed.
-        normalized =
-            Regex::new("\\s*//(\\[.*\\])?~.*").unwrap().replace_all(&normalized, "").into_owned();
+        lazy_static! {
+            static ref ANNOTATION_RE: Regex = Regex::new("\\s*//(\\[.*\\])?~.*").unwrap();
+        }
+
+        normalized = ANNOTATION_RE.replace_all(&normalized, "").into_owned();
+
+        // This code normalizes various hashes in v0 symbol mangling that is
+        // emitted in the ui and mir-opt tests.
+        lazy_static! {
+            static ref V0_CRATE_HASH_PREFIX_RE: Regex =
+                Regex::new(r"_R.*?Cs[0-9a-zA-Z]+_").unwrap();
+            static ref V0_CRATE_HASH_RE: Regex = Regex::new(r"Cs[0-9a-zA-Z]+_").unwrap();
+        }
 
-        // This code normalizes various hashes in both
-        // v0 and legacy symbol names that are emitted in
-        // the ui and mir-opt tests.
-        //
-        // Some tests still require normalization with headers.
-        const DEFID_HASH_REGEX: &str = r"\[[0-9a-z]{4}\]";
-        const DEFID_HASH_PLACEHOLDER: &str = r"[HASH]";
-        const V0_DEMANGLING_HASH_REGEX: &str = r"\[[0-9a-z]+\]";
-        const V0_DEMANGLING_HASH_PLACEHOLDER: &str = r"[HASH]";
-        const V0_CRATE_HASH_PREFIX_REGEX: &str = r"_R.*?Cs[0-9a-zA-Z]+_";
-        const V0_CRATE_HASH_REGEX: &str = r"Cs[0-9a-zA-Z]+_";
         const V0_CRATE_HASH_PLACEHOLDER: &str = r"CsCRATE_HASH_";
-        const V0_BACK_REF_PREFIX_REGEX: &str = r"\(_R.*?B[0-9a-zA-Z]_";
-        const V0_BACK_REF_REGEX: &str = r"B[0-9a-zA-Z]_";
-        const V0_BACK_REF_PLACEHOLDER: &str = r"B<REF>_";
-        const LEGACY_SYMBOL_HASH_REGEX: &str = r"h[\w]{16}E?\)";
-        const LEGACY_SYMBOL_HASH_PLACEHOLDER: &str = r"h<SYMBOL_HASH>)";
-        let test_name = self
-            .output_testname_unique()
-            .into_os_string()
-            .into_string()
-            .unwrap()
-            .split('.')
-            .next()
-            .unwrap()
-            .replace("-", "_");
-        // Normalize `DefId` hashes
-        let defid_regex = format!("{}{}", test_name, DEFID_HASH_REGEX);
-        let defid_placeholder = format!("{}{}", test_name, DEFID_HASH_PLACEHOLDER);
-        normalized = Regex::new(&defid_regex)
-            .unwrap()
-            .replace_all(&normalized, defid_placeholder)
-            .into_owned();
-        // Normalize v0 demangling hashes
-        let demangling_regex = format!("{}{}", test_name, V0_DEMANGLING_HASH_REGEX);
-        let demangling_placeholder = format!("{}{}", test_name, V0_DEMANGLING_HASH_PLACEHOLDER);
-        normalized = Regex::new(&demangling_regex)
-            .unwrap()
-            .replace_all(&normalized, demangling_placeholder)
-            .into_owned();
-        // Normalize v0 crate hashes (see RFC 2603)
-        let symbol_mangle_prefix_re = Regex::new(V0_CRATE_HASH_PREFIX_REGEX).unwrap();
-        if symbol_mangle_prefix_re.is_match(&normalized) {
+        if V0_CRATE_HASH_PREFIX_RE.is_match(&normalized) {
             // Normalize crate hash
-            normalized = Regex::new(V0_CRATE_HASH_REGEX)
-                .unwrap()
-                .replace_all(&normalized, V0_CRATE_HASH_PLACEHOLDER)
-                .into_owned();
+            normalized =
+                V0_CRATE_HASH_RE.replace_all(&normalized, V0_CRATE_HASH_PLACEHOLDER).into_owned();
         }
-        let back_ref_prefix_re = Regex::new(V0_BACK_REF_PREFIX_REGEX).unwrap();
-        if back_ref_prefix_re.is_match(&normalized) {
+
+        lazy_static! {
+            static ref V0_BACK_REF_PREFIX_RE: Regex = Regex::new(r"\(_R.*?B[0-9a-zA-Z]_").unwrap();
+            static ref V0_BACK_REF_RE: Regex = Regex::new(r"B[0-9a-zA-Z]_").unwrap();
+        }
+
+        const V0_BACK_REF_PLACEHOLDER: &str = r"B<REF>_";
+        if V0_BACK_REF_PREFIX_RE.is_match(&normalized) {
             // Normalize back references (see RFC 2603)
-            let back_ref_regex = format!("{}", V0_BACK_REF_REGEX);
-            let back_ref_placeholder = format!("{}", V0_BACK_REF_PLACEHOLDER);
-            normalized = Regex::new(&back_ref_regex)
-                .unwrap()
-                .replace_all(&normalized, back_ref_placeholder)
-                .into_owned();
+            normalized =
+                V0_BACK_REF_RE.replace_all(&normalized, V0_BACK_REF_PLACEHOLDER).into_owned();
         }
-        // Normalize legacy mangled symbols
-        normalized = Regex::new(LEGACY_SYMBOL_HASH_REGEX)
-            .unwrap()
-            .replace_all(&normalized, LEGACY_SYMBOL_HASH_PLACEHOLDER)
-            .into_owned();
 
         // Custom normalization rules
         for rule in custom_rules {