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\DOC inst_type
\TYPE {inst_type : ((type # type) list -> type -> type)}
\SYNOPSIS
Instantiates types in a type.
\DESCRIBE
If {[(t1',t1);...;(tn',tn)]} is a list of type instantiations, where {t1...tn}
are the initial types, and {t1'...tn'} the desired instantiations, and {ty} is
a type to instantiate, the call
{
inst_type [(t1',t1);...;(tn',tn)] ty
}
\noindent will appropriately instantiate the type {ty}. The instantiations will
be performed in parallel. If several of the type instantiations are applicable,
the choice is undefined. In normal use the {t1...tn} are type variables,
although this is not essential. Neither is it necessary that any or all of the
types {t1...tn} should in fact appear in {ty}.
\FAILURE
Never fails.
\EXAMPLE
{
#inst_type [(":bool",":*")] ":* # **";;
":bool # **" : type
#inst_type [(":num",":* # **"); (":bool",":*")] ":* # **";;
":num" : type
#inst_type [(":bool",":*"); (":num",":* # **")] ":* # **";;
":num" : type
#inst_type [(":bool",":num"); (":num",":bool")] ":(bool)list";;
":(num)list" : type
}
\SEEALSO
inst, inst_check, inst_type, INST_TYPE.
\ENDDOC
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