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lexer: Allow for negative lookahead within a command.
authorBen Pfaff <blp@cs.stanford.edu>
Tue, 23 Nov 2021 03:16:48 +0000 (19:16 -0800)
committerBen Pfaff <blp@cs.stanford.edu>
Mon, 6 Dec 2021 17:05:31 +0000 (09:05 -0800)
This allows to getting the location of prior tokens within a command,
which makes it easier to find the end of a group of tokens that was just
parsed by referring to the token at offset -1.


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