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error: inherent impls cannot be `const`
--> $DIR/span-bug-issue-121418.rs:6:12
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LL | impl const dyn T {
| ----- ^^^^^ inherent impl for this type
| |
| `const` because of this
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= note: only trait implementations may be annotated with `const`
error[E0277]: the size for values of type `(dyn T + 'static)` cannot be known at compilation time
--> $DIR/span-bug-issue-121418.rs:8:27
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LL | pub const fn new() -> std::sync::Mutex<dyn T> {}
| ^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
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= help: within `Mutex<(dyn T + 'static)>`, the trait `Sized` is not implemented for `(dyn T + 'static)`
note: required because it appears within the type `Mutex<(dyn T + 'static)>`
--> $SRC_DIR/std/src/sync/poison/mutex.rs:LL:COL
= note: the return type of a function must have a statically known size
error[E0308]: mismatched types
--> $DIR/span-bug-issue-121418.rs:8:27
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LL | pub const fn new() -> std::sync::Mutex<dyn T> {}
| --- ^^^^^^^^^^^^^^^^^^^^^^^ expected `Mutex<dyn T>`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
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= note: expected struct `Mutex<(dyn T + 'static)>`
found unit type `()`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
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