Returns 1 if the specified animation action exists for the player.

The result of this trigger is undefined if the player has been placed in a custom state by a successful hit. In this situation, use SelfAnimExist.

Format: AnimExist(exprn)

Arguments:

- exprn (int): An expression evaluating to an animation number.

Return type: boolean (0 if false or 1 if true)

Error conditions: Returns 'Bottom' if exprn evaluates to 'Bottom'.

Example:

`trigger1 = !AnimExist(200)
; Triggers if the player is missing action 200.`