error: expected identifier, found reserved identifier `_` --> $DIR/infer-arg-test.rs:7:17 | LL | struct BadInfer<_>; | ^ expected identifier, found reserved identifier error: expected identifier, found reserved identifier `_` --> $DIR/infer-arg-test.rs:13:17 | LL | fn bad_infer_fn<_>() {} | ^ expected identifier, found reserved identifier error[E0392]: parameter `_` is never used --> $DIR/infer-arg-test.rs:7:17 | LL | struct BadInfer<_>; | ^ unused parameter | = help: consider removing `_`, referring to it in a field, or using a marker such as `PhantomData` = help: if you intended `_` to be a const parameter, use `const _: usize` instead error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0392`.