[Issue 20791] New: extern(C++ <strings>) should allow a trailing comma

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20791

          Issue ID: 20791
           Summary: extern(C++ <strings>) should allow a trailing comma
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: moonlightsentinel at disroot.org

Compiling this code

================================
extern(C++, "foo",)
struct S {}
================================

fails with:

comma.d(1): Error: expression expected, not `)`
comma.d(2): Error: found `struct` when expecting `)`
comma.d(2): Error: no identifier for declarator `S`
comma.d(2): Error: declaration expected, not `{

This is inconsistent because a trailing comma is allowed for function
arguments, array literals, ... .

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