1error[E0308]: mismatched types 2 --> $DIR/type-parameter-names.rs:5:5 3 | 4LL | fn foo<Foo, Bar>(x: Foo) -> Bar { 5 | --- --- --- expected `Bar` because of return type 6 | | | 7 | | expected type parameter 8 | found type parameter 9LL | x 10 | ^ expected type parameter `Bar`, found type parameter `Foo` 11 | 12 = note: expected type parameter `Bar` 13 found type parameter `Foo` 14 = note: a type parameter was expected, but a different one was found; you might be missing a type parameter or trait bound 15 = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters 16 17error: aborting due to previous error 18 19For more information about this error, try `rustc --explain E0308`. 20