The following (IMHO valid) code snippet triggers an ICE on mainline when compiled with -std=gnu++0x:
========================================== void foo() { (const char&&)0; } ========================================== bug.cc: In function 'void foo()': bug.cc:3: internal compiler error: in build_c_cast, at cp/typeck.c:5621 Please submit a full bug report, [etc.] -- Summary: ICE with rvalue references and casts Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: ice-on-valid-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=35076