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error[E0308]: mismatched types
--> $DIR/issue-91450-inner-ty-error.rs:4:13
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LL | fn foo() -> Option<_> {}
| --- ^^^^^^^^^ expected `Option<_>`, found `()`
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| implicitly returns `()` as its body has no tail or `return` expression
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= note: expected enum `Option<_>`
found unit type `()`
error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
--> $DIR/issue-91450-inner-ty-error.rs:4:20
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LL | fn foo() -> Option<_> {}
| ^ not allowed in type signatures
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0121, E0308.
For more information about an error, try `rustc --explain E0121`.
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