Rollup merge of #67251 - oli-obk:stability_sieve, r=Centril

Require `allow_internal_unstable` for stable min_const_fn using unsta…

…ble features

r? @Centril

cc @ecstatic-morse @RalfJung

src/librustc_mir/transform/qualify_min_const_fn.rs

@@ -80,7 +80,7 @@ fn check_ty(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span, fn_def_id: DefId) -> Mc
     for ty in ty.walk() {
         match ty.kind {
             ty::Ref(_, _, hir::Mutability::Mutable) => {
-                if !tcx.features().const_mut_refs {
+                if !feature_allowed(tcx, fn_def_id, sym::const_mut_refs) {
                     return Err((
                         span,
                         "mutable references in const fn are unstable".into(),
@@ -220,7 +220,7 @@ fn check_statement(
         }
 
         | StatementKind::FakeRead(FakeReadCause::ForMatchedPlace, _)
-        if !tcx.features().const_if_match
+        if !feature_allowed(tcx, def_id, sym::const_if_match)
         => {
             Err((span, "loops and conditional expressions are not stable in const fn".into()))
         }
@@ -272,7 +272,7 @@ fn check_place(
     while let &[ref proj_base @ .., elem] = cursor {
         cursor = proj_base;
         match elem {
-            ProjectionElem::Downcast(..) if !tcx.features().const_if_match
+            ProjectionElem::Downcast(..) if !feature_allowed(tcx, def_id, sym::const_if_match)
                 => return Err((span, "`match` or `if let` in `const fn` is unstable".into())),
             ProjectionElem::Downcast(_symbol, _variant_index) => {}
 
@@ -329,7 +329,7 @@ fn check_terminator(
 
         | TerminatorKind::FalseEdges { .. }
         | TerminatorKind::SwitchInt { .. }
-        if !tcx.features().const_if_match
+        if !feature_allowed(tcx, def_id, sym::const_if_match)
         => Err((
             span,
             "loops and conditional expressions are not stable in const fn".into(),
@@ -341,7 +341,7 @@ fn check_terminator(
         }
 
         // FIXME(ecstaticmorse): We probably want to allow `Unreachable` unconditionally.
-        TerminatorKind::Unreachable if tcx.features().const_if_match => Ok(()),
+        TerminatorKind::Unreachable if feature_allowed(tcx, def_id, sym::const_if_match) => Ok(()),
 
         | TerminatorKind::Abort | TerminatorKind::Unreachable => {
             Err((span, "const fn with unreachable code is not stable".into()))

src/test/ui/consts/const-mut-refs/const_mut_refs.rs

@@ -1,6 +1,7 @@
 // run-pass
 
 #![feature(const_mut_refs)]
+#![feature(const_fn)]
 
 struct Foo {
     x: usize

src/test/ui/consts/control-flow/basics.rs

@@ -4,6 +4,7 @@
 
 #![feature(const_panic)]
 #![feature(const_if_match)]
+#![feature(const_fn)]
 
 const X: u32 = 4;
 const Y: u32 = 5;

src/test/ui/consts/control-flow/exhaustive-c-like-enum-match.rs

@@ -3,6 +3,7 @@
 // check-pass
 
 #![feature(const_if_match)]
+#![feature(const_fn)]
 
 enum E {
     A,

src/test/ui/consts/control-flow/feature-gate-const-if-match.if_match.stderr

@@ -1,5 +1,5 @@
 error: fatal error triggered by #[rustc_error]
-  --> $DIR/feature-gate-const-if-match.rs:108:1
+  --> $DIR/feature-gate-const-if-match.rs:109:1
    |
 LL | / fn main() {
 LL | |     let _ = [0; {

src/test/ui/consts/control-flow/feature-gate-const-if-match.rs

@@ -6,6 +6,7 @@
 
 #![feature(rustc_attrs)]
 #![cfg_attr(if_match, feature(const_if_match))]
+#![feature(const_fn)]
 
 const _: i32 = if true { //[stock]~ ERROR `if` is not allowed in a `const`
     5

src/test/ui/consts/control-flow/feature-gate-const-if-match.stock.stderr

@@ -1,5 +1,5 @@
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:10:16
+  --> $DIR/feature-gate-const-if-match.rs:11:16
    |
 LL |   const _: i32 = if true {
    |  ________________^
@@ -13,7 +13,7 @@ LL | | };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:16:16
+  --> $DIR/feature-gate-const-if-match.rs:17:16
    |
 LL |   const _: i32 = if let Some(true) = Some(false) {
    |  ________________^
@@ -27,7 +27,7 @@ LL | | };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:22:16
+  --> $DIR/feature-gate-const-if-match.rs:23:16
    |
 LL |   const _: i32 = match 1 {
    |  ________________^
@@ -41,7 +41,7 @@ LL | | };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `static`
-  --> $DIR/feature-gate-const-if-match.rs:29:13
+  --> $DIR/feature-gate-const-if-match.rs:30:13
    |
 LL |     let x = if true { 0 } else { 1 };
    |             ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,7 +50,7 @@ LL |     let x = if true { 0 } else { 1 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `static`
-  --> $DIR/feature-gate-const-if-match.rs:31:13
+  --> $DIR/feature-gate-const-if-match.rs:32:13
    |
 LL |     let x = match x { 0 => 1, _ => 0 };
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -59,7 +59,7 @@ LL |     let x = match x { 0 => 1, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `static`
-  --> $DIR/feature-gate-const-if-match.rs:33:5
+  --> $DIR/feature-gate-const-if-match.rs:34:5
    |
 LL |     if let Some(x) = Some(x) { x } else { 1 }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -68,7 +68,7 @@ LL |     if let Some(x) = Some(x) { x } else { 1 }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `static mut`
-  --> $DIR/feature-gate-const-if-match.rs:38:13
+  --> $DIR/feature-gate-const-if-match.rs:39:13
    |
 LL |     let x = if true { 0 } else { 1 };
    |             ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -77,7 +77,7 @@ LL |     let x = if true { 0 } else { 1 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `static mut`
-  --> $DIR/feature-gate-const-if-match.rs:40:13
+  --> $DIR/feature-gate-const-if-match.rs:41:13
    |
 LL |     let x = match x { 0 => 1, _ => 0 };
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -86,7 +86,7 @@ LL |     let x = match x { 0 => 1, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `static mut`
-  --> $DIR/feature-gate-const-if-match.rs:42:5
+  --> $DIR/feature-gate-const-if-match.rs:43:5
    |
 LL |     if let Some(x) = Some(x) { x } else { 1 }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -95,7 +95,7 @@ LL |     if let Some(x) = Some(x) { x } else { 1 }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:47:5
+  --> $DIR/feature-gate-const-if-match.rs:48:5
    |
 LL |     if true { 5 } else { 6 }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -104,7 +104,7 @@ LL |     if true { 5 } else { 6 }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:51:5
+  --> $DIR/feature-gate-const-if-match.rs:52:5
    |
 LL | /     if let Some(true) = a {
 LL | |         0
@@ -117,7 +117,7 @@ LL | |     }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:59:5
+  --> $DIR/feature-gate-const-if-match.rs:60:5
    |
 LL | /     match i {
 LL | |         i if i > 10 => i,
@@ -130,7 +130,7 @@ LL | |     }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:90:17
+  --> $DIR/feature-gate-const-if-match.rs:91:17
    |
 LL |         let x = if y { 0 } else { 1 };
    |                 ^^^^^^^^^^^^^^^^^^^^^
@@ -139,7 +139,7 @@ LL |         let x = if y { 0 } else { 1 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:92:17
+  --> $DIR/feature-gate-const-if-match.rs:93:17
    |
 LL |         let x = match x { 0 => 1, _ => 0 };
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -148,7 +148,7 @@ LL |         let x = match x { 0 => 1, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const fn`
-  --> $DIR/feature-gate-const-if-match.rs:94:9
+  --> $DIR/feature-gate-const-if-match.rs:95:9
    |
 LL |         if let Some(x) = Some(x) { x } else { 1 }
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -157,7 +157,7 @@ LL |         if let Some(x) = Some(x) { x } else { 1 }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:110:17
+  --> $DIR/feature-gate-const-if-match.rs:111:17
    |
 LL |         let x = if false { 0 } else { 1 };
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -166,7 +166,7 @@ LL |         let x = if false { 0 } else { 1 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:112:17
+  --> $DIR/feature-gate-const-if-match.rs:113:17
    |
 LL |         let x = match x { 0 => 1, _ => 0 };
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -175,7 +175,7 @@ LL |         let x = match x { 0 => 1, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:114:9
+  --> $DIR/feature-gate-const-if-match.rs:115:9
    |
 LL |         if let Some(x) = Some(x) { x } else { 1 }
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -184,7 +184,7 @@ LL |         if let Some(x) = Some(x) { x } else { 1 }
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:67:21
+  --> $DIR/feature-gate-const-if-match.rs:68:21
    |
 LL |     const IF: i32 = if true { 5 } else { 6 };
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -193,7 +193,7 @@ LL |     const IF: i32 = if true { 5 } else { 6 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:70:25
+  --> $DIR/feature-gate-const-if-match.rs:71:25
    |
 LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -202,7 +202,7 @@ LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:73:24
+  --> $DIR/feature-gate-const-if-match.rs:74:24
    |
 LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -211,7 +211,7 @@ LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:78:21
+  --> $DIR/feature-gate-const-if-match.rs:79:21
    |
 LL |     const IF: i32 = if true { 5 } else { 6 };
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -220,7 +220,7 @@ LL |     const IF: i32 = if true { 5 } else { 6 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `if` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:81:25
+  --> $DIR/feature-gate-const-if-match.rs:82:25
    |
 LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -229,7 +229,7 @@ LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0658]: `match` is not allowed in a `const`
-  --> $DIR/feature-gate-const-if-match.rs:84:24
+  --> $DIR/feature-gate-const-if-match.rs:85:24
    |
 LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -238,7 +238,7 @@ LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
    = help: add `#![feature(const_if_match)]` to the crate attributes to enable
 
 error[E0019]: constant contains unimplemented expression type
-  --> $DIR/feature-gate-const-if-match.rs:114:21
+  --> $DIR/feature-gate-const-if-match.rs:115:21
    |
 LL |         if let Some(x) = Some(x) { x } else { 1 }
    |                     ^

src/test/ui/consts/control-flow/short-circuit-let.rs

@@ -4,6 +4,7 @@
 
 #![feature(const_if_match)]
 #![feature(const_panic)]
+#![feature(const_fn)]
 
 const X: i32 = {
     let mut x = 0;

src/test/ui/consts/control-flow/single_variant_match_ice.rs

@@ -1,6 +1,6 @@
 // check-pass
 
-#![feature(const_if_match)]
+#![feature(const_if_match, const_fn)]
 
 enum Foo {
     Prob,