syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // is one, we rely on the symbol being instantiated locally.
context_before:             // For generics we might find re-usable upstream instances. If there
context_after:             instance.upstream_monomorphization(tcx).unwrap_or(LOCAL_CRATE)