1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/consts/issue-54954.stderr b/tests/ui/consts/issue-54954.stderr
new file mode 100644
index 000000000..850558287
--- /dev/null
+++ b/tests/ui/consts/issue-54954.stderr
@@ -0,0 +1,34 @@
+error[E0379]: functions in traits cannot be declared const
+  --> $DIR/issue-54954.rs:5:5
+   |
+LL |     const fn const_val<T: Sized>() -> usize {
+   |     ^^^^^ functions in traits cannot be const
+
+error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
+  --> $DIR/issue-54954.rs:1:24
+   |
+LL |   const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot call associated function of trait
+...
+LL | /     const fn const_val<T: Sized>() -> usize {
+LL | |
+LL | |         core::mem::size_of::<T>()
+LL | |     }
+   | |_____- `Tt::const_val` defined here
+
+note: erroneous constant used
+  --> $DIR/issue-54954.rs:11:15
+   |
+LL | fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
+   |               ^^^^^^^
+
+note: erroneous constant used
+  --> $DIR/issue-54954.rs:11:34
+   |
+LL | fn f(z: [f32; ARR_LEN]) -> [f32; ARR_LEN] {
+   |                                  ^^^^^^^
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0379, E0790.
+For more information about an error, try `rustc --explain E0379`.