tests

src/test/ui/const-generics/issues/issue-69654-run-pass.rs

@@ -0,0 +1,19 @@
+#![feature(const_generics)]
+#![allow(incomplete_features, unused_braces)]
+
+trait Bar<T> {}
+impl<T> Bar<T> for [u8; {7}] {}
+
+struct Foo<const N: usize> {}
+impl<const N: usize> Foo<N>
+where
+    [u8; N]: Bar<[(); N]>,
+{
+    fn foo() {}
+}
+
+fn main() {
+    Foo::foo();
+    //~^ ERROR no function or associated item named `foo`
+    // FIXME(const_generics): The above should not error
+}

src/test/ui/const-generics/issues/issue-69654-run-pass.stderr

@@ -0,0 +1,15 @@
+error[E0599]: no function or associated item named `foo` found for struct `Foo<{_: usize}>` in the current scope
+  --> $DIR/issue-69654-run-pass.rs:16:10
+   |
+LL | struct Foo<const N: usize> {}
+   | -------------------------- function or associated item `foo` not found for this
+...
+LL |     Foo::foo();
+   |          ^^^ function or associated item not found in `Foo<{_: usize}>`
+   |
+   = note: the method `foo` exists but the following trait bounds were not satisfied:
+           `[u8; _]: Bar<[(); _]>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0599`.

src/test/ui/const-generics/issues/issue-69654.rs

@@ -0,0 +1,19 @@
+#![feature(const_generics)]
+#![allow(incomplete_features)]
+
+trait Bar<T> {}
+impl<T> Bar<T> for [u8; T] {}
+//~^ ERROR expected value, found type parameter `T`
+
+struct Foo<const N: usize> {}
+impl<const N: usize> Foo<N>
+where
+    [u8; N]: Bar<[(); N]>,
+{
+    fn foo() {}
+}
+
+fn main() {
+    Foo::foo();
+    //~^ ERROR no function or associated item named `foo`
+}

src/test/ui/const-generics/issues/issue-69654.stderr

@@ -0,0 +1,22 @@
+error[E0423]: expected value, found type parameter `T`
+  --> $DIR/issue-69654.rs:5:25
+   |
+LL | impl<T> Bar<T> for [u8; T] {}
+   |                         ^ not a value
+
+error[E0599]: no function or associated item named `foo` found for struct `Foo<{_: usize}>` in the current scope
+  --> $DIR/issue-69654.rs:17:10
+   |
+LL | struct Foo<const N: usize> {}
+   | -------------------------- function or associated item `foo` not found for this
+...
+LL |     Foo::foo();
+   |          ^^^ function or associated item not found in `Foo<{_: usize}>`
+   |
+   = note: the method `foo` exists but the following trait bounds were not satisfied:
+           `[u8; _]: Bar<[(); _]>`
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0423, E0599.
+For more information about an error, try `rustc --explain E0423`.