The C++ frontend stumbles over the following invalid code snippet since GCC 3.4.5:
======================= int foo() { return i ""= i; } ======================= bug.cc: In function 'int foo()': bug.cc:3: error: 'i' was not declared in this scope bug.cc:3: error: expected ';' before string constant bug.cc:3: error: assignment of read-only location bug.cc:3: internal compiler error: tree check: expected class 'type', have 'exceptional' (error_mark) in build_modify_expr, at cp/typeck.c:5720 Please submit a full bug report, [etc.] -- Summary: [4.0/4.1/4.2 regression] ICE with invalid assignment Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: ice-on-invalid-code, error-recovery, 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=27716