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error[E0562]: `impl Trait` is not allowed in generic parameter defaults
--> $DIR/issue-83929-impl-trait-in-generic-default.rs:1:16
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LL | struct Foo<T = impl Copy>(T);
| ^^^^^^^^^
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= note: `impl Trait` is only allowed in arguments and return types of functions and methods
error[E0562]: `impl Trait` is not allowed in generic parameter defaults
--> $DIR/issue-83929-impl-trait-in-generic-default.rs:4:20
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LL | type Result<T, E = impl std::error::Error> = std::result::Result<T, E>;
| ^^^^^^^^^^^^^^^^^^^^^^
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= note: `impl Trait` is only allowed in arguments and return types of functions and methods
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0562`.
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