http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51223
Bug #: 51223 Summary: [4.5/4.6/4.7 Regression] ICE with invalid function parameter Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: reich...@gcc.gnu.org The following invalid code snippet triggers an ICE since GCC 4.5.0: ========================== struct A { A foo(void i = 0); }; void bar() { A().foo(); } A A::foo(void i) { return A(); } ========================== bug.cc:3:18: error: 'i' has incomplete type bug.cc:3:19: error: invalid use of 'void' bug.cc: In function 'void bar()': bug.cc:8:11: error: call to 'A A::foo(<type error>)' uses the default argument for parameter 1, which is not yet defined bug.cc: At global scope: bug.cc:11:15: error: 'i' has incomplete type bug.cc:11:16: error: invalid use of 'void' bug.cc: In function 'void bar()': bug.cc:8:11: internal compiler error: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at tree-ssa.c:1460 Please submit a full bug report, [etc.]