1error[E0277]: the size for values of type `str` cannot be known at compilation time 2 --> tests/ui/opaque_not_sized.rs:4:14 3 | 44 | type TypeR; 5 | ^^^^^ doesn't have a size known at compile-time 6 | 7 = help: within `TypeR`, the trait `Sized` is not implemented for `str` 8note: required because it appears within the type `TypeR` 9 --> tests/ui/opaque_not_sized.rs:8:8 10 | 118 | struct TypeR(str); 12 | ^^^^^ 13note: required by a bound in `__AssertSized` 14 --> tests/ui/opaque_not_sized.rs:4:9 15 | 164 | type TypeR; 17 | ^^^^^^^^^^^ required by this bound in `__AssertSized` 18