syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"ExternAbi::Fastcall"}]}
source_snippet:                     ExternAbi::Fastcall { .. } | ExternAbi::Vectorcall { .. } => {
context_before:                 let (flavor, regparm) = match abi {
context_after:                         (x86::Flavor::FastcallOrVectorcall, None)