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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | \DOC arity
\TYPE {arity : (string -> int)}
\SYNOPSIS
Returns the arity of a type operator.
\DESCRIBE
{arity `op`} returns {n} if {op} is the name of an {n}-ary type operator ({n}
can be 0), and otherwise fails.
\FAILURE
{arity st} fails if {st} is not the name of a type constant or type operator.
\SEEALSO
is_type.
\ENDDOC
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