[llvm-bugs] [Bug 39928] New: Fails to detect redefinition of struct when nesting in C11 program.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39928

            Bug ID: 39928
           Summary: Fails to detect redefinition of struct when nesting in
                    C11 program.
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: anders.granlund.0 at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Consider the following C11 program (prog.c):

  int main()
  { 
    struct S { struct S { int a; } b; };
  }

It was compiled with the following command line:

  clang prog.c -std=c11 -pedantic-errors "-w"

The expected behaviour was to get an error about redefinition of the struct S,
but no errors are given. The two struct definitions are in the same scope
(block scope) so they should conflict. There are no struct scopes in C11.

Note that gcc gives the expected error.

Online compiler link: https://wandbox.org/permlink/JeT9d5XpZLOxJLuj

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