http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45873
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-16 17:04:12 UTC --- (In reply to comment #3) > This seems like a dup of 35722. Ah yes, it definitely is for the call to foo<p1> in my second example in comment 2: modifying pt.c to always complain at the FIXME in coerce_template_parms produces the "sorry" for the call to foo<p1> 45873.c2.cc: In function 'int main()': 45873.c2.cc:14:18: sorry, unimplemented: cannot expand 'Args ...' into a fixed-length argument list 45873.c2.cc:14:18: error: no matching function for call to 'foo(int, double)' 45873.c2.cc:14:18: note: candidate is: 45873.c2.cc:8:6: note: template<template<class ...> class T, class ... Args> T<Args ...> foo(Args ...) 45873.c2.cc:15:18: error: no matching function for call to 'foo(int, double)' 45873.c2.cc:15:18: note: candidate is: 45873.c2.cc:8:6: note: template<template<class ...> class T, class ... Args> T<Args ...> foo(Args ...) But that "sorry" isn't reached for foo<p2> or for any foo<pair> in the other testcases. I don't know if that means something else is going on there, or if it's just an undiagnosed case of the same situation.
