Bug 20499 – bad error message caused by UFCS attempt on the identifier matching to an import

a.d --- module a; class Foo { private int x; } --- --- module b; import a; void test(Foo foo) { foo.a++; } --- then in the same directory as the two files $ dmd b.d output: > Error: function expected before `()`, not `module a` of type `void` The real problem here is that `Foo` does not contain any member named a. The bad message leads to think that the compiler tries a function `foo` on the import `a`, i.e by UFCS but the only existing `foo` is a class. Also if you look at the command line you can note that "a.d" is not specified. I don't know why dmd automatically detects the file. If this is part of this strange issue then what is expected is > module `a` is in file 'a.d' which cannot be read

*** This issue has been marked as a duplicate of issue 10957 ***