error: lifetime flowing from input to output with different syntax can be confusing
  --> crates\libs\metadata\src\reader\tables\constant.rs:21:19
   |
21 |     pub fn parent(&self) -> HasConstant {
   |                   ^^^^^     ----------- the lifetime gets resolved as `'_`
   |                   |
   |                   this lifetime flows to the output
   |
   = note: `-D mismatched-lifetime-syntaxes` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(mismatched_lifetime_syntaxes)]`
help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
   |
21 |     pub fn parent(&self) -> HasConstant<'_> {
   |                                        ++++