The following (IMHO invalid) code snippet triggers an ICE since GCC 4.0.0: ========================================= template<const int&> struct A {};
template<typename T> struct B { A<T(0)> a; }; B<const int&> b; ========================================= bug.cc: In instantiation of 'B<const int&>': bug.cc:8: instantiated from here bug.cc:5: internal compiler error: tree check: expected tree that contains 'decl minimal' structure, have 'indirect_ref' in decl_linkage, at cp/tree.c:2191 Please submit a full bug report, [etc.] Before GCC 4.0.0 the following (not too helpful, if not bogus) error message was issued: bug.cc: In instantiation of `B<const int&>': bug.cc:8: instantiated from here bug.cc:5: error: `0' is not a valid template argument -- Summary: [4.0/4.1/4.2 regression] ICE with references as template parameters Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: ice-on-invalid-code, 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=28341