[Issue 24201] New: ImportC: enum in .di file should have members un-namespaced.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24201

          Issue ID: 24201
           Summary: ImportC: enum in .di file should have members
                    un-namespaced.
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: ImportC
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

If you have a C file like:

// enum.c
enum Foo {
    FOO_0,
    FOO_1,
    FOO_2,
};

which you convert to a .di file, it will contain (macro enums removed for
brevity):

extern (C)
{
        enum Foo
        {
                FOO_0,
                FOO_1,
                FOO_2,
        }
}

Which is an incorrect translation. The imported C file will allow you to access
the members of Foo without name spacing, like `FOO_0`, while the .di file will
require you to write `Foo.FOO_0`. The enum members should be aliased into the
module scope so that both imports function the same way. That is important as
you might generate a .di file so your editor auto-complete works, but you want
to compile with the actual .c file in case the code you are compiling against
changes.

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