[cfe-dev] ParseClassSpecifier: can "unions" inherit?

[Argiris Kirtzidis]

Ted Kremenek wrote:
> I just noticed the following code fragment in ParseClassSpecifier:
>
>    // Parse the tag portion of this.
>    DeclTy *TagDecl = Actions.ActOnTag(CurScope, TagType, TK, StartLoc,  
> Name,
>                                       NameLoc, Attr);
>
>    // Parse the optional base clause (C++ only).
>    if (getLang().CPlusPlus && Tok.is(tok::colon)) {
>      ParseBaseClause(TagDecl);
>    }
>
> It appears from the code that the 'if' branch can be taken even if the  
> tag decl is a union.  Is this valid in the C++ grammar?  That is, can  
> there be a "base clause" for unions in C++, and if so, what does that  
> mean?
>   

It gets flagged as error by Sema. In
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