A broken diagnostic is issued for the following invalid code snippet since GCC 4.0.0:
==================================================== void foo(__complex__ double x) { __builtin_conj(x)(); } ==================================================== bug.cc: In function 'void foo(double __complex__)': bug.cc:3: error: '#'conj_expr' not supported by dump_expr#<expression error>' cannot be used as a function -- Summary: [4.1/4.2/4.3/4.4 regression] Broken diagnostic for complex builtin Product: gcc Version: 4.4.0 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=35333