A broken diagnostic is issued for the following invalid code snippet since GCC 3.4.0, but only when compiled with "-O" or higher:
======================== int foo(int); void bar(int i, int j) { foo(i && j)(); } ======================== bug.cc: In function 'void bar(int, int)': bug.cc:5: error: 'foo(((int)#'truth_and_expr' not supported by dump_expr#<expression error>))' cannot be used as a function -- Summary: [4.1/4.2/4.3 regression] Broken diagnostic: 'truth_and_expr' not supported by dump_expr 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=34965