{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//!"}]}
//! A "matcher position" (a.k.a. "position" or "mp") is a dot in the middle of a matcher, usually
//!
//! written as a `·`. For example `· a $( a )* a b` is one, as is `a $( · a )* a b`.