syntaxError when enum constant clashes with other type name

[Frank Winklmeier]

The following is a minimal reproducer of a syntaxError that we encountered in our code base. The real example was much less evident as it was split over many includes:

namespace NS1 {
  typedef NS2::Bar Bar;
  using NS2::MyType;
}

enum E : unsigned int {
  zero   =  0,
  MyType =  1
};

namespace NS1 {
}

results in

test.cxx:6:1: error: syntax error [syntaxError]
enum E : unsigned int {
^

Change or remove any one line, or rename one of the "MyType", and the error goes away.

[CHR]

https://trac.cppcheck.net/ticket/13451