[Issue 4371] segfault(template.c) template tuple in is() expression

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4371



--- Comment #3 from Don <clugdbug at yahoo.com.au> 2010-11-26 12:35:50 PST ---
There's something wrong with the patch.

This part breaks Phobos unit tests:

-        if (!sc->insert(s))
-            error("declaration %s is already defined", s->toChars());
        if (sc->sd)
            s->addMember(sc, sc->sd, 1);
+        else if (!sc->insert(s))
+            error("declaration %s is already defined", s->toChars());

Changing the first of those lines to:

        if (!isTuple(tded) && !sc->insert(s))
            error("declaration %s is already defined", s->toChars());

allows the test code to compile. But I don't really understand why it should be
necessary. Possibly it's another bug which is being triggered.

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