error: const `impl` for trait `FromResidual` which is not marked with `#[const_trait]` --> $DIR/const-try.rs:15:12 | LL | impl const FromResidual for TryMe { | ^^^^^^^^^^^^^^^^^^^ this trait is not `const` | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change error: const `impl` for trait `Try` which is not marked with `#[const_trait]` --> $DIR/const-try.rs:22:12 | LL | impl const Try for TryMe { | ^^^ this trait is not `const` | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change error[E0015]: `?` is not allowed on `TryMe` in constant functions --> $DIR/const-try.rs:35:5 | LL | TryMe?; | ^^^^^^ | = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants error[E0015]: `?` is not allowed on `TryMe` in constant functions --> $DIR/const-try.rs:35:5 | LL | TryMe?; | ^^^^^^ | = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0015`.