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[Bug c++/35022] [4.3 regression] ICE with parameter pack in template constant parameter



------- Comment #1 from dgregor at gcc dot gnu dot org  2008-02-15 03:35 -------
This test case actually exposes two (!) related issues, one of which is a
rejects-valid:

  template<typename... T, template<T...> class X> void foo(X<0>);

and the other, which is an ice-on-valid-code:

  template<typename... T, template<T...p> class X> void foo(X<0>);

The issue for both the original test case and this last test case is that
coerce_template_parameter_pack doesn't expect to get a pack expansion back from
tsubst_pack_expansion, but of course this happens in nested templates like this
template template parameter.

Note to myself: the parameter pack SIZEOF_EXPR handling doesn't deal with pack
expansions coming back from tsubst_pack_expansion, either. I can probably craft
a test case to illustrate this issue.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35022


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