assert : ('a -> bool) -> 'a -> 'a

SYNOPSIS
Checks that a value satisfies a predicate.

DESCRIBE
assert p x returns x if the application p x yields true. Otherwise, assert p x fails.

FAILURE
assert p x fails with exception HOL_ERR if the predicate p yields false when applied to the value x. If the application p x raises an exception e, then assert p x raises e.

EXAMPLE
    - null [];
    > val it = true : bool

    - assert null ([]:int list);
    > val it = [] : int list

    - null [1];
    > false : bool

    - assert null [1];
    ! Uncaught exception:
    ! HOL_ERR <poly>

SEEALSO  Lib,   can,   assert_exn,   with_exn

HOL  Kananaskis 0