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scanner: treat trailing reverse solidus as an escape - #25
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CSS Syntax 3 treats "\" at EOF as a valid escape (replacement
character). Include it in {escape} so ident/hash tokens are not split.
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Fixes #14.
A reverse solidus at EOF is a valid escape (CSS Syntax 3 consume-an-escaped-code-point returns U+FFFD). The
{escape}production required a following character, sofoo\split into IDENTfooplus CHAR\.Include
\\$in{escape}so ident/hash tokens keep the trailing escape. Token values stay source text, matching the rest of this scanner.