Module ability 

Ability – helper functions for in-play abilities. Mirrors Java’s Ability.java (base class for abilities on permanents). In Rust the subclass is flattened into SpellAbility.

Functions

can_play

Whether this in-play ability can currently be played. Mirrors Java’s Ability.canPlay().

Type Aliases

Ability

Type alias for SpellAbility when used as an in-play ability. In Java, Ability is a subclass; in Rust it’s the same struct with is_activated = true.