error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/bad-infer-in-trait-impl.rs:6:15
   |
LL |     fn bar(s: _) {}
   |               ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL |     fn bar<T>(s: T) {}
   |           +++    ~

error[E0050]: method `bar` has 1 parameter but the declaration in trait `Foo::bar` has 0
  --> $DIR/bad-infer-in-trait-impl.rs:6:15
   |
LL |     fn bar();
   |     --------- trait requires 0 parameters
...
LL |     fn bar(s: _) {}
   |               ^ expected 0 parameters, found 1

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0050, E0121.
For more information about an error, try `rustc --explain E0050`.