error[E0593]: function is expected to take 1 argument, but it takes 2 arguments
  --> $DIR/issue-47706.rs:11:22
   |
LL |     pub fn new(foo: Option<i32>, _: ()) -> Foo {
   |     ------------------------------------------ takes 2 arguments
...
LL |         self.foo.map(Foo::new)
   |                      ^^^^^^^^ expected function that takes 1 argument

error[E0593]: function is expected to take 0 arguments, but it takes 1 argument
  --> $DIR/issue-47706.rs:27:9
   |
LL |     Bar(i32),
   |     -------- takes 1 argument
...
LL | fn foo<F>(f: F)
   |    --- required by a bound in this
LL | where
LL |     F: Fn(),
   |        ---- required by this bound in `foo`
...
LL |     foo(Qux::Bar);
   |         ^^^^^^^^ expected function that takes 0 arguments

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0593`.