[llvm-bugs] [Bug 26048] New: Missing diagnostic for overloaded names in anonymous unions

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26048

            Bug ID: 26048
           Summary: Missing diagnostic for overloaded names in anonymous
                    unions
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: aprantl at apple.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

class A {
 class B {};
 union {
   B B; // This should be an error.
  };
  // Name lookup error if uncommented.
  // sizeof(B);
};


As of r256962 this compiles fine, however
[class.union] §9.5.5 states that "The names of the members of an anonymous
union shall be distinct from the names of any other entity in the scope in
which the anonymous union is declared.”

This does generate a name lookup error if B is used, but that's too late.

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