[LLVMbugs] [Bug 4070] New: error recovery improvement for stmtexprs

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4070

           Summary: error recovery improvement for stmtexprs
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Keywords: quality-of-implementation
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu


In this example:

struct fooo {} ;
struct fooo x;

void test(void) {

  *({
    0;
    x/x;
    });
}

We emit two diagnostics: one about x/x (good) and one about "indirection
requires a pointer operand".  The problem is that we correctly kill the
expression tree for x/x, but that means that we build and return a  compound
statement with just { 0; } and the stmt expr gets built with type int.  We
should somehow propagate invalidity of the last statement in a stmt expr up
into the stmt expr itself.

This came from PR4065.


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