The following invalid code snippet triggers an ICE on mainline and 4.2 branch:
===================================== template<int> struct A { A(int); }; template<int N> A<N>::A() {} struct B { A<0> a; }; B b; ===================================== bug.cc:6: error: prototype for 'A<N>::A()' does not match any in class 'A<N>' bug.cc:3: error: candidate is: A<N>::A(int) bug.cc:6: error: template definition of non-template 'A<N>::A()' bug.cc:13: internal compiler error: in locate_ctor, at cp/method.c:899 Please submit a full bug report, [etc.] If I replace "A(int);" by "A(0);" I get a slightly different crash: bug.cc:3: error: expected unqualified-id before numeric constant bug.cc:3: error: expected `)' before numeric constant bug.cc:6: error: no 'A<N>::A()' member function declared in class 'A<N>' bug.cc:6: error: template definition of non-template 'A<N>::A()' bug.cc:13: internal compiler error: vector VEC(tree,base) index domain error, in locate_ctor at cp/method.c:889 Please submit a full bug report, [etc.] -- Summary: [4.2/4.3 regression] ICE on invalid constructor definition 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=31131