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+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`.