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\DOC null_inst
\TYPE {null_inst : instantiation}
\SYNOPSIS
Empty instantiation.
\DESCRIBE
Several functions use objects of type {instantiation}, consisting of type and
term instantiations and higher-order matching information. This instantiation
{null_inst} is the trivial instantiation that does nothing.
\FAILURE
Not applicable.
\EXAMPLE
Instantiating a term with it has no effect:
{
# instantiate null_inst `x + 1 = 2`;;
val it : term = `x + 1 = 2`
}
\SEEALSO
instantiate, INSTANTIATE, INSTANTIATE_ALL, term_match.
\ENDDOC
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