error[E0308]: mismatched types --> $DIR/variance-use-contravariant-struct-1.rs:22:5 | LL | v //~ ERROR mismatched types | ^ lifetime mismatch | = note: expected type `SomeStruct<&'min ()>` found type `SomeStruct<&'max ()>` note: the lifetime 'min as defined on the function body at 18:8... --> $DIR/variance-use-contravariant-struct-1.rs:18:8 | LL | fn foo<'min,'max>(v: SomeStruct<&'max ()>) | ^^^^ note: ...does not necessarily outlive the lifetime 'max as defined on the function body at 18:13 --> $DIR/variance-use-contravariant-struct-1.rs:18:13 | LL | fn foo<'min,'max>(v: SomeStruct<&'max ()>) | ^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.