{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"CanonAbi::X86(X86Call::Fastcall)"}]}
        CanonAbi::X86(X86Call::Fastcall) => ("@", "@"),
    let (prefix, suffix) = match callconv {
        CanonAbi::X86(X86Call::Stdcall) => ("_", "@"),