[Issue 11614] New: Error: this for _expand_field_0 needs to be type Tuple not type Foo

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11614

           Summary: Error: this for _expand_field_0 needs to be type Tuple
                    not type Foo
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: doob at me.com


--- Comment #0 from Jacob Carlborg <doob at me.com> 2013-11-26 23:46:39 PST ---
The following code used to compile with DMD 2.063.2:

import std.typecons;

struct Foo
{
    alias Tuple!(int) NEW_ARGS;

    NEW_ARGS args;

    void foo ()
    {
        static if (NEW_ARGS.length == 1) {}
    }
}

But compiling the above code with DMD 2.064.2 results in this error:

typecons.d(389): Error: this for _expand_field_0 needs to be type Tuple not
type Foo

Am I doing something wrong or is this a regression? If I do any of the
following the code will compile:

* Move the static-if outside of "foo"
* Replace "NEW_ARGS.length" with "args.length" in the static-if

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