syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"(ExternAbi::Fastcall"}]}
source_snippet:             (ExternAbi::Fastcall { .. }, Arch::X86) => CanonAbi::X86(X86Call::Fastcall),
context_after:             (ExternAbi::Fastcall { .. }, _) if os == OsKind::Windows => {