[LLVMbugs] [Bug 18555] New: CreateBuiltinUnaryOp accepts invalid operations

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18555

            Bug ID: 18555
           Summary: CreateBuiltinUnaryOp accepts invalid operations
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alp at nuanti.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

CreateOverloadedUnaryOp() says:

     // No viable function; fall through to handling this as a
     // built-in operator, which will produce an error message for us.

But CreateBuiltinUnaryOp() doesn't always produce an error, causing various
accepts-invalid issues.

This really needs an assert, but other code depending on the broken behaviour
like RebuildForRangeWithDereference() needs to be fixed first..

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