diff --git a/Cargo.lock b/Cargo.lock
index 5ef801cb623..e71ae26bb31 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3209,7 +3209,6 @@ dependencies = [
  "serde",
  "serde_json",
  "smallvec",
- "tempfile",
  "tracing",
 ]
 
@@ -3303,7 +3302,6 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "smallvec",
- "stable_deref_trait",
  "stacker",
  "tempfile",
  "thin-vec",
@@ -3516,7 +3514,6 @@ dependencies = [
  "rustc_trait_selection",
  "rustc_type_ir",
  "smallvec",
- "thin-vec",
  "tracing",
 ]
 
@@ -3653,7 +3650,6 @@ dependencies = [
  "rustc_trait_selection",
  "rustc_traits",
  "rustc_ty_utils",
- "smallvec",
  "tracing",
 ]
 
@@ -3761,7 +3757,6 @@ dependencies = [
  "rustc_span",
  "rustc_target",
  "rustc_type_ir",
- "smallvec",
  "snap",
  "tempfile",
  "tracing",
@@ -3891,7 +3886,6 @@ dependencies = [
  "rustc_target",
  "serde",
  "serde_json",
- "smallvec",
  "tracing",
 ]
 
@@ -4010,7 +4004,6 @@ version = "0.0.0"
 dependencies = [
  "parking_lot 0.11.2",
  "rustc-rayon-core",
- "rustc_arena",
  "rustc_ast",
  "rustc_data_structures",
  "rustc_errors",
@@ -4080,7 +4073,6 @@ dependencies = [
  "rustc_fluent_macro",
  "rustc_fs_util",
  "rustc_hir",
- "rustc_index",
  "rustc_lint_defs",
  "rustc_macros",
  "rustc_serialize",
@@ -4149,7 +4141,6 @@ dependencies = [
  "rustc_data_structures",
  "rustc_feature",
  "rustc_fs_util",
- "rustc_index",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
@@ -4167,7 +4158,6 @@ checksum = "8ba09476327c4b70ccefb6180f046ef588c26a24cf5d269a9feba316eb4f029f"
 name = "rustc_trait_selection"
 version = "0.0.0"
 dependencies = [
- "itertools",
  "rustc_ast",
  "rustc_attr",
  "rustc_data_structures",
@@ -4199,7 +4189,6 @@ dependencies = [
  "rustc_ast",
  "rustc_data_structures",
  "rustc_hir",
- "rustc_index",
  "rustc_infer",
  "rustc_middle",
  "rustc_span",
diff --git a/compiler/rustc_codegen_llvm/Cargo.toml b/compiler/rustc_codegen_llvm/Cargo.toml
index bdea565a5a6..5e750d91b82 100644
--- a/compiler/rustc_codegen_llvm/Cargo.toml
+++ b/compiler/rustc_codegen_llvm/Cargo.toml
@@ -36,6 +36,5 @@ rustc_target = { path = "../rustc_target" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 rustc_ast = { path = "../rustc_ast" }
 rustc_span = { path = "../rustc_span" }
-tempfile = "3.2.0"
 serde = { version = "1", features = [ "derive" ]}
 serde_json = "1"
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
index bd1ac6b7bad..a421535c9b4 100644
--- a/compiler/rustc_codegen_ssa/Cargo.toml
+++ b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -12,7 +12,6 @@ bitflags = "1.2.1"
 cc = "1.0.69"
 itertools = "0.10.1"
 tracing = "0.1"
-libc = "0.2.50"
 jobserver = "0.1.22"
 tempfile = "3.2"
 thorin-dwp = "0.4"
@@ -43,6 +42,9 @@ rustc_query_system = { path = "../rustc_query_system" }
 rustc_target = { path = "../rustc_target" }
 rustc_session = { path = "../rustc_session" }
 
+[target.'cfg(unix)'.dependencies]
+libc = "0.2.50"
+
 [dependencies.object]
 version = "0.30.1"
 default-features = false
diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
index 39f4bc63c88..5e05fe463ed 100644
--- a/compiler/rustc_data_structures/Cargo.toml
+++ b/compiler/rustc_data_structures/Cargo.toml
@@ -26,7 +26,6 @@ smallvec = { version = "1.8.1", features = [
     "union",
     "may_dangle",
 ] }
-stable_deref_trait = "1.0.0"
 stacker = "0.1.15"
 tempfile = "3.2"
 thin-vec = "0.2.12"
diff --git a/compiler/rustc_hir_analysis/Cargo.toml b/compiler/rustc_hir_analysis/Cargo.toml
index f56cedebfb0..4eb94d5bc63 100644
--- a/compiler/rustc_hir_analysis/Cargo.toml
+++ b/compiler/rustc_hir_analysis/Cargo.toml
@@ -27,5 +27,4 @@ rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_lint_defs = { path = "../rustc_lint_defs" }
 rustc_type_ir = { path = "../rustc_type_ir" }
 rustc_feature = { path = "../rustc_feature" }
-thin-vec = "0.2.12"
 tracing = "0.1"
diff --git a/compiler/rustc_interface/Cargo.toml b/compiler/rustc_interface/Cargo.toml
index 4569c35e182..41a0254df18 100644
--- a/compiler/rustc_interface/Cargo.toml
+++ b/compiler/rustc_interface/Cargo.toml
@@ -10,7 +10,6 @@ libloading = "0.7.1"
 tracing = "0.1"
 rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc-rayon = { version = "0.5.0", optional = true }
-smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 rustc_ast = { path = "../rustc_ast" }
 rustc_attr = { path = "../rustc_attr" }
 rustc_borrowck = { path = "../rustc_borrowck" }
diff --git a/compiler/rustc_metadata/Cargo.toml b/compiler/rustc_metadata/Cargo.toml
index 0e54d6aa946..840111c31b4 100644
--- a/compiler/rustc_metadata/Cargo.toml
+++ b/compiler/rustc_metadata/Cargo.toml
@@ -11,7 +11,6 @@ libloading = "0.7.1"
 odht = { version = "0.3.1", features = ["nightly"] }
 snap = "1"
 tracing = "0.1"
-smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tempfile = "3.2"
 rustc_middle = { path = "../rustc_middle" }
 rustc_attr = { path = "../rustc_attr" }
diff --git a/compiler/rustc_monomorphize/Cargo.toml b/compiler/rustc_monomorphize/Cargo.toml
index 5ecd68c79bb..6d3a3bf906e 100644
--- a/compiler/rustc_monomorphize/Cargo.toml
+++ b/compiler/rustc_monomorphize/Cargo.toml
@@ -8,7 +8,6 @@ edition = "2021"
 [dependencies]
 serde = "1"
 serde_json = "1"
-smallvec = { version = "1.8.1", features = [ "union", "may_dangle" ] }
 tracing = "0.1"
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
diff --git a/compiler/rustc_query_system/Cargo.toml b/compiler/rustc_query_system/Cargo.toml
index 34e57637976..e02cf38b671 100644
--- a/compiler/rustc_query_system/Cargo.toml
+++ b/compiler/rustc_query_system/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2021"
 
 [dependencies]
 parking_lot = "0.11"
-rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
diff --git a/compiler/rustc_session/Cargo.toml b/compiler/rustc_session/Cargo.toml
index 15dbfbfd387..3477b97438c 100644
--- a/compiler/rustc_session/Cargo.toml
+++ b/compiler/rustc_session/Cargo.toml
@@ -14,7 +14,6 @@ rustc_fluent_macro = { path = "../rustc_fluent_macro" }
 rustc_target = { path = "../rustc_target" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_data_structures = { path = "../rustc_data_structures" }
-rustc_index = { path = "../rustc_index" }
 rustc_span = { path = "../rustc_span" }
 rustc_fs_util = { path = "../rustc_fs_util" }
 rustc_ast = { path = "../rustc_ast" }
diff --git a/compiler/rustc_target/Cargo.toml b/compiler/rustc_target/Cargo.toml
index 4e7a8d166ae..dff22fad4ec 100644
--- a/compiler/rustc_target/Cargo.toml
+++ b/compiler/rustc_target/Cargo.toml
@@ -11,7 +11,6 @@ rustc_fs_util = { path = "../rustc_fs_util" }
 rustc_abi = { path = "../rustc_abi" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_feature = { path = "../rustc_feature" }
-rustc_index = { path = "../rustc_index" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
diff --git a/compiler/rustc_trait_selection/Cargo.toml b/compiler/rustc_trait_selection/Cargo.toml
index a81459317be..83605627d6f 100644
--- a/compiler/rustc_trait_selection/Cargo.toml
+++ b/compiler/rustc_trait_selection/Cargo.toml
@@ -25,4 +25,3 @@ rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 rustc_transmute = { path = "../rustc_transmute", features = ["rustc"] }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-itertools = "0.10.1"
diff --git a/compiler/rustc_traits/Cargo.toml b/compiler/rustc_traits/Cargo.toml
index eff6fb26dd4..dfd6fbff7c9 100644
--- a/compiler/rustc_traits/Cargo.toml
+++ b/compiler/rustc_traits/Cargo.toml
@@ -8,7 +8,6 @@ tracing = "0.1"
 rustc_middle = { path = "../rustc_middle" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_hir = { path = "../rustc_hir" }
-rustc_index = { path = "../rustc_index" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }