Misleading error message when trying to invoke function typed field via null receiver

[stereotype441]

The following code produces an error in the CFE (as it should):

class C {
  void Function() foo;
  C(this.foo);
}
f(C? c) {
  c.foo(); // (1)
}

But the error message itself is misleading; it seems to be saying that I'm trying to use c as a function, which I'm definitely not doing:

../../tmp/proj/test.dart:6:5: Error: Can't use an expression of type 'C?' as a function because it's potentially null.
 - 'C' is from '../../tmp/proj/test.dart'.
Try calling using ?.call instead.
  c.foo();
    ^

Note that if you remove the () on line (1) you get a far more reasonable error message; I would have expected this more reasonable error message regardless of whether the () is present:

../../tmp/proj/test.dart:6:5: Error: Property 'foo' cannot be accessed on 'C?' because it is potentially null.
 - 'C' is from '../../tmp/proj/test.dart'.
Try accessing using ?. instead.
  c.foo;
    ^^^