The following invalid code snippet triggers an ICE on mainline and the 4.3 branch:
==================================================== struct A { A(const A&); }; struct B { operator A&(); }; void foo(const B& b) { const A a = b; } ==================================================== bug.cc: In function 'void foo(const B&)': bug.cc:13: error: passing 'const B' as 'this' argument of 'B::operator A&()' discards qualifiers bug.cc:13: error: invalid conversion from 'A' to 'A' bug.cc:13: internal compiler error: in ocp_convert, at cp/cvt.c:627 Please submit a full bug report, [etc.] This is a regression on the 4.3 branch as 4.3.0 didn't crash. Note, that the error message "invalid conversion from 'A' to 'A'" isn't really helpful. -- Summary: [4.3/4.4 regression] ICE with invalid conversion Product: gcc Version: 4.4.0 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=36407