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digitalmars.D.bugs - [Issue 20831] New: __traits(getAttributes) failes to compile when

https://issues.dlang.org/show_bug.cgi?id=20831

          Issue ID: 20831
           Summary: __traits(getAttributes) failes to compile when used on
                    a parameter with no name
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: atila.neves gmail.com

With dmd v2.091.1, this code fails to compile (it doesn't even print fail in
the pragma, it just doesn't compile):

----------------------------------------
void foo(int f, float,  ("test") string s = "test") {}

static if(is(typeof(foo) Params == __parameters))
    pragma(msg, __traits(getAttributes, Params[1..2]));
else
    pragma(msg, "fail");
----------------------------------------

But moving the code to a function makes it work somehow:

----------------------------------------
void foo(int f, float,  ("test") string s = "test") {}

void main() {
    static if(is(typeof(foo) Params == __parameters))
        pragma(msg, __traits(getAttributes, Params[1..2]));
    else
        pragma(msg, "fail");
}
----------------------------------------

The 2nd version correctly prints "tuple()". In the 1st non-working version,
naming the 2nd parameter also makes the problem go away.

--
May 14