[LLVMbugs] [Bug 23891] New: scoped enumeration error messages are an embarrassment

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23891

            Bug ID: 23891
           Summary: scoped enumeration error messages are an embarrassment
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: chandlerc at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I just got the worst syntax error message I've seen in a long time:

In file included from ../lib/CodeGen/PostRASchedulerList.cpp:27:
../include/llvm/Analysis/AliasAnalysis.h:129:57: error: invalid operands to
binary expression ('llvm::FunctionModRefLocation' and 'llvm::ModRefInfo')
  DoesNotAccessMemory = FunctionModRefLocation::Nowhere | ModRefInfo::NoModRef,
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~
../include/llvm/Analysis/AliasAnalysis.h:137:48: error: invalid operands to
binary expression ('llvm::FunctionModRefLocation' and 'llvm::ModRefInfo')
      FunctionModRefLocation::ArgumentPointees | ModRefInfo::Ref,
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
../include/llvm/Analysis/AliasAnalysis.h:145:48: error: invalid operands to
binary expression ('llvm::FunctionModRefLocation' and 'llvm::ModRefInfo')
      FunctionModRefLocation::ArgumentPointees | ModRefInfo::ModRef,
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~
../include/llvm/Analysis/AliasAnalysis.h:153:54: error: invalid operands to
binary expression ('llvm::FunctionModRefLocation' and 'llvm::ModRefInfo')
  OnlyReadsMemory = FunctionModRefLocation::Anywhere | ModRefInfo::Ref,
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~

The bug is that these are scoped enumerations and so there is no '|' operator
(it would require an implicit conversion to int). But the error message
literally tells me nothing other than that there *is* an error. =[ =[ =[

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