The following invalid code snippet is accepted since gcc 3.0 (without warning, even with -pedantic -Wall -W):
======================= struct A { typedef int ::X; }; ======================= -- Summary: [3.3/3.4/4.0 regression] invalid scope qualifier allowed in typedef Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: accepts-invalid Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: reichelt at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19395