File: is_let.doc

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\DOC is_let

\TYPE {is_let : (term -> bool)}

\SYNOPSIS
Tests a term to see if it is a {let}-expression.

\DESCRIBE
{is_let "LET f x"} returns {true}. If the term is not a {let}-expression (or
of the more general {"LET f x"} form) the result is {false}.

\FAILURE
Never fails.

\EXAMPLE
{
#is_let "LET ($= 1) 2";;
true : bool

#is_let "let x = 2 in (x = 1)";;
true : bool
}
\SEEALSO
mk_let, dest_let.

\ENDDOC