octal encoded character after \c. This seemed to be prohibited at
r13836, but its ChangeLog mentions nothing about this prohibition.
So I assume this prohibition is not intended. [ruby-core:27229]
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numeric literal without digits. based on a patch from ujihisa .
in [ruby-dev:39811]. [ruby-dev:39798]
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* parse.y (xstring, regexp, dsym, literal_concat, evstr2dstr):
literal at the top of dstr is no longer needed if it is empty,
since concatstrings and toregexp always create new strings.
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