1 error[E0308]: mismatched types
2 --> $DIR/issue-3680.rs:13:9
5 | ^^^^^^ expected enum `std::option::Option`, found enum `std::result::Result`
7 = note: expected type `std::option::Option<_>`
8 found type `std::result::Result<_, _>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0308`.