Rollup merge of #92780 - b-naber:postpone-const-eval-coherence, r=lcnr

Directly use ConstValue for single literals in blocks

Addresses the minimal repro in https://github.com/rust-lang/rust/issues/92186, but doesn't fix the underlying problem (which would be solved by solving the anon subst problem afaict).

I do, however, think that it makes sense in general to treat single literals in anon blocks as const values directly, especially in light of the problem that the issue refers to (anon const evaluation being postponed until infer variables in substs can be resolved, which was introduced by https://github.com/rust-lang/rust/pull/90023), i.e. while we do get warnings for those unnecessary braces, we should try to avoid errors caused by those braces if possible.

4 files changed, 40 insertions, 4 deletions

diff --git a/src/test/ui/const-generics/issues/issue-92186.rs b/src/test/ui/const-generics/issues/issue-92186.rs
new file mode 100644
index 00000000000..9ced4667d24
--- /dev/null
+++ b/src/test/ui/const-generics/issues/issue-92186.rs
@@ -0,0 +1,12 @@
+// check-pass
+
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+pub struct Foo<const N: usize>;
+pub trait Bar<T> {}
+
+impl<T> Bar<T> for Foo<{ 1 }> {}
+impl<T> Bar<T> for Foo<{ 2 }> {}
+
+fn main() {}
diff --git a/src/test/ui/const-generics/types-mismatch-const-args.full.stderr b/src/test/ui/const-generics/types-mismatch-const-args.full.stderr
index 565c9ba1ff1..4d6b752867f 100644
--- a/src/test/ui/const-generics/types-mismatch-const-args.full.stderr
+++ b/src/test/ui/const-generics/types-mismatch-const-args.full.stderr
@@ -15,9 +15,20 @@ LL |     let _: A<'a, u16, {2u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data
    |            |
    |            expected due to this
    |
-   = note: expected struct `A<'a, u16, {2u32}, {3u32}>`
-              found struct `A<'b, u32, {2u32}, {3u32}>`
+   = note: expected struct `A<'a, u16, _, _>`
+              found struct `A<'b, u32, _, _>`
 
-error: aborting due to 2 previous errors
+error[E0308]: mismatched types
+  --> $DIR/types-mismatch-const-args.rs:18:41
+   |
+LL |     let _: A<'a, u16, {4u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data: PhantomData };
+   |            --------------------------   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u16`, found `u32`
+   |            |
+   |            expected due to this
+   |
+   = note: expected struct `A<'a, u16, 4_u32, _>`
+              found struct `A<'b, u32, 2_u32, _>`
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/const-generics/types-mismatch-const-args.min.stderr b/src/test/ui/const-generics/types-mismatch-const-args.min.stderr
index ec9221d2486..8b60238cb0c 100644
--- a/src/test/ui/const-generics/types-mismatch-const-args.min.stderr
+++ b/src/test/ui/const-generics/types-mismatch-const-args.min.stderr
@@ -20,6 +20,17 @@ LL |     let _: A<'a, u16, {2u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data
    = note: expected struct `A<'a, u16, _, _>`
               found struct `A<'b, u32, _, _>`
 
-error: aborting due to 2 previous errors
+error[E0308]: mismatched types
+  --> $DIR/types-mismatch-const-args.rs:18:41
+   |
+LL |     let _: A<'a, u16, {4u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data: PhantomData };
+   |            --------------------------   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u16`, found `u32`
+   |            |
+   |            expected due to this
+   |
+   = note: expected struct `A<'a, u16, 4_u32, _>`
+              found struct `A<'b, u32, 2_u32, _>`
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/src/test/ui/const-generics/types-mismatch-const-args.rs b/src/test/ui/const-generics/types-mismatch-const-args.rs
index c2092c4268e..43ef28b268f 100644
--- a/src/test/ui/const-generics/types-mismatch-const-args.rs
+++ b/src/test/ui/const-generics/types-mismatch-const-args.rs
@@ -15,6 +15,8 @@ fn a<'a, 'b>() {
     //~^ ERROR mismatched types
     let _: A<'a, u16, {2u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data: PhantomData };
     //~^ ERROR mismatched types
+    let _: A<'a, u16, {4u32}, {3u32}> = A::<'b, u32, {2u32}, {3u32}> { data: PhantomData };
+    //~^ ERROR mismatched types
 }
 
 pub fn main() {}