The following invalid testcase triggers an ICE on mainline:
============================================================
template<typename> struct A {};
template<typename...T> void foo(A<T>, A<T>);
template<typename...T> void foo(A<T>, A<T>) {}
============================================================
bug.cc:3: error: parameter packs not expanded with `...':
bug.cc:3: note: 'T'
bug.cc:5: error: parameter packs not expanded with `...':
bug.cc:5: note: 'T'
bug.cc:5: internal compiler error: canonical types differ for identical types
A<<expression error> > and A<<expression error> >
Please submit a full bug report, [etc.]
The bug appeared between 2007-11-03 and 2007-11-06.
--
Summary: [4.3 regression] ICE with invalid variadic template
functions
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: ice-on-invalid-code, error-recovery, monitored
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34103
