The C++ frontend issues a broken diagnostic for the following invalid testcase since GCC 3.1:
============================== extern double fabs(double); void foo(double x) { fabs(x)(); } ============================== bug.cc: In function 'void foo(double)': bug.cc:5: error: '#'abs_expr' not supported by dump_expr#<expression error>' cannot be used as a function -- Summary: [4.1/4.2/4.3 regression] Broken diagnostic: 'abs_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=34394