if3[syntax] if3 c less equal greater
SRFI-67: If3 is the 3-way conditional for comparisons. First c is
evaluated, resulting in value C.
The value C must be an exact integer in {-1, 0, 1}, otherwise an error is signalled.
If C = -1 then the value of the
if3-expression is obtained by evaluating less. If C = 0 then equal is
evaluated. If C = 1 then greater is evaluated.
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