File: outl.doc

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\DOC outl

\TYPE {outl : ((* + **) -> *)}

\SYNOPSIS
Projects out of left summand.

\DESCRIBE
The function {outl} is associated with the disjoint union
construction of types. It projects out of the left summand of the union.

\FAILURE
Fails if the operand is a right summand.

\EXAMPLE
{
#let x = inl 1
#and y = inr 2;;
x = inl 1 : (int + *)
y = inr 2 : (* + int)

#outl x;;
1 : int

#outl y;;
evaluation failed     outl
}
\SEEALSO
outr inl inr isl.

\ENDDOC