r2c

Describe the bug
Patterns for Go multiple return values match more strictly than the argument list, which is confusing.

To Reproduce
Try to match any Go function that has error in the return type list. All six of these functions should match:

func a(b int) error { return nil }
func b() (int, error) { return 0, nil }
func c() (error, int) { return nil, 0 }
func d() (float6