error[E0308]: mismatched types
--> src/format.rs:51:6
|
51 | ) -> Option<String> {
| -------------- expected `std::option::Option<std::string::String>` because of return type
52 | / for ann in annotations {
53 | | match (ann.range.0, ann.range.1) {
... |
71 | | }
72 | | }
| |_____^ expected enum `std::option::Option`, found ()
|