Don't comment warnings. Don't put #warnings about warnings. _FIX_ warnings.
This fixes the warning, and makes the binary smaller out of sheer pique. (Yes, since Manuel did this one it's nice tight code that took several attempts to shrink, but I was ticked.) Add the start of a test for uniq; this is about the first 1/3 of the tests we need for full susv3 coverage of uniq.
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@ -3041,7 +3041,7 @@
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"\t-f\tforce overwrite an existing file"
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#define uniq_trivial_usage \
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"[OPTION]... [INPUT [OUTPUT]]"
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"[-fscdu]... [INPUT [OUTPUT]]"
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#define uniq_full_usage \
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"Discard all but one of successive identical lines from INPUT\n" \
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"(or standard input), writing to OUTPUT (or standard output).\n\n" \
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