{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//!"}]}
//! are constants we will not turn into patterns. We capture these with `Constructor::Opaque`. These
//! unclear and the lang team is working on clarifying what we want to do there. In any case, there
//! `Opaque` patterns do not participate in exhaustiveness, specialization or overlap checking.