rust.kak: lifetimes do not include the following non-word character.
rust.kak: lifetimes do not include the following non-word character.

A Rust data structure that is generic over a type conventionally uses a single
capital letter for the type variable, like `Vec<T>` or `HashMap<K, V>`. A Rust
data structure that is generic over a reference-lifetime conventionally uses an
apostrophe followed by a single lower-case letter for the lifetime variable,
like `Something<'a>`.

Previously, Kakoune would highlight "'a>" as the lifetime parameter; with this
change Kakoune highlights "'a" and leaves the closing ">" alone.

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