syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"(ExternAbi::Unadjusted,"}]}
source_snippet:             (ExternAbi::Unadjusted, _) => CanonAbi::C,
context_before:             (ExternAbi::Rust | ExternAbi::RustCall, _) => CanonAbi::Rust,