[rfc] Wswitch test case (which fails)

[Andrew Cagney]

The -Wswitch flag is currently broken in GCC.  The attached testcase is 
intended to check that functionality.  Consequently, it fails.  (I'm 
currently wiggling things to see it works with an old GCC).

I'm wondering what GCC's policy is on committing tests that fail, but 
illustrate regressions, is.

enjoy,
Andrew
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