The following invalid code snippet triggers a broken diagnostic on mainline:
====================================================================== template<int> void foo() { __is_class((int); } ====================================================================== bug.cc: In function 'void foo()': bug.cc:3: error: expected type-specifier before '(' token bug.cc:3: error: expected `)' before '(' token bug.cc:3: error: expected primary-expression before 'int' bug.cc:3: error: '#'trait_expr' not supported by dump_expr#<expression error>' cannot be used as a function -- Summary: [4.3 regression] Broken diagnostic: 'trait_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=33212