error[E0119]: conflicting implementations of trait `Foo<_>` for type `Option<_>` --> $DIR/coherence-projection-conflict-ty-param.rs:10:1 | LL | impl > Foo

for Option {} | ---------------------------------------- first implementation here LL | LL | impl Foo for Option { } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Option<_>` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0119`.