error[E0282]: type annotations needed
  --> $DIR/issue-6458.rs:9:4
   |
LL |    foo(TypeWithState(marker::PhantomData));
   |    ^^^ cannot infer type for type parameter `State` declared on the function `foo`
   |
help: type parameter declared here
  --> $DIR/issue-6458.rs:6:12
   |
LL | pub fn foo<State>(_: TypeWithState<State>) {}
   |            ^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0282`.