syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // gets the least-dereferenced type).
context_before:         // adjustments in *reverse order* (last-in-first-out, so that the last `Deref` inserted
context_after:         let unadjusted_pat = match pat.kind {