syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"(ExternAbi::System"}]}
source_snippet:             (ExternAbi::System { .. }, Arch::X86) if os == OsKind::Windows && !has_c_varargs => {
context_after:                 CanonAbi::X86(X86Call::Stdcall)