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\TYPE {$- : ((int # int) -> int)}
\SYNOPSIS
Performs subtraction on ML integers.
\KEYWORDS
arithmetic, number.
\FAILURE
Never fails.
\COMMENTS
Unary {-} exists as an internal parser object, but not as a function. So,
whilst typing in {-1;;} will work, {-;;} will return a parse error.
\ENDDOC
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