syntax_data: {"ast_node_type":"import","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // here because it performs normalization and const evaluation.
context_before:         // The `PatCtxt` is normally used in pattern exhaustiveness checking, but reused
context_after:         let dropless_arena = rustc_arena::DroplessArena::default();