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