[cfe-dev] non-virtual/virtual const/non-const Decl::getCanonicalDecl()

[Craig Topper]

While adding 'override' keywords I noticed some oddities with
getCanonicalDecl.

There is a non-const virtual version declared in Decl that is overridden in
many places. There is also a const version in derived classes that is not
virtual that just redirects to the const/virtual using const_cast.

This pattern breaks in FunctionDecl and CXXRecordDecl when the const
version becomes virtual as well.

Was the original intention here to just have a single vtable entry?

Thanks,
~Craig
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