The following invalid code snippet triggers a broken diagnostic since at least GCC 2.95.3:
==================== struct A { bool b; }; void f(A a) { a.b--; } ==================== bug.cc: In function 'void f(A)': bug.cc:8: error: invalid use of '--' on bool variable '#'component_ref' not supported by dump_decl#<declaration error>' -- Summary: Broken diagnostic: 'component_ref' not supported by dump_decl Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: diagnostic, 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=33208