Fix a bug in uambiguous prefixes. #290
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Specifically, given the strings ABCX, CDAX and BCX, it was reporting the unambiguous set as A, BCX and CDAX, which is wrong since A is a substring of CDAX. unambiguous_prefixes is now quite a bit of a mess, but so is the rest of the literal extraction code. The only thing it has going for it is a massive test suite. Fixes rust-lang#289
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Specifically, given the strings ABCX, CDAX and BCX, it was reporting
the unambiguous set as A, BCX and CDAX, which is wrong since A is a
substring of CDAX.
unambiguous_prefixes is now quite a bit of a mess, but so is the rest
of the literal extraction code. The only thing it has going for it is
a massive test suite.
Fixes #289