[LLVMbugs] [Bug 8673] New: poor error recovery on incorrect type name in method argument

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8673

           Summary: poor error recovery on incorrect type name in method
                    argument
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


This code:


class ABC;
class foo {
  void bar(ABC *X);
};
void foo::bar(DEF *X) {
}

produces:


t.cc:8:11: error: variable has incomplete type 'void'
void foo::bar(DEF *X) {
          ^
t.cc:8:15: error: use of undeclared identifier 'DEF'
void foo::bar(DEF *X) {
              ^
t.cc:8:20: error: use of undeclared identifier 'X'
void foo::bar(DEF *X) {
                   ^
t.cc:8:22: error: expected ';' after top level declarator
void foo::bar(DEF *X) {
                     ^
                     ;
4 errors generated.


because the parser gets to DEF (which it doesn't know, and decides that DEF
isn't or couldn't be a type, so it backtracks and parses the code as "void
foo;" which goes horribly wrong downstream.

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