syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"(ExternAbi::Aapcs"}]}
source_snippet:             (ExternAbi::Aapcs { .. }, _) => return AbiMapping::Invalid,
context_before:             (ExternAbi::Aapcs { .. }, Arch::Arm(..)) => CanonAbi::Arm(ArmCall::Aapcs),