lacheck - 1.26-17.1+b1 main

LaCheck is a simple syntax checker for LaTex that is based on a
single-pass lexical scanner. This makes clear that there are a lot of
LaTeX problems this program cannot find, although it will find most
simple mistakes. Complex macro packages may, however, make it completely
unusable.
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This program was bundled with AUCTeX once upon a time and is best known
from there.