File: is_abs.doc

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\DOC is_abs

\TYPE {is_abs : term -> bool}

\SYNOPSIS
Tests a term to see if it is an abstraction.

\DESCRIBE
{is_abs `\var. t`} returns {true}. If the term is not an abstraction the
result is {false}.

\FAILURE
Never fails.

\EXAMPLE
{
  # is_abs `\x. x + 1`;;
  val it : bool = true

  # is_abs `!x. x >= 0`;;
  val it : bool = false
}

\SEEALSO
mk_abs, dest_abs, is_var, is_const, is_comb.

\ENDDOC