syntax_data: {"ast_node_type":"function","tokens":[{"end":90,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn canonize_abi(&self, extern_abi: ExternAbi, has_c_varargs: bool) -> AbiMapping {
context_before:     /// lower an [ExternAbi] to a [CanonAbi] if this AbiMap allows
context_after:         let AbiMap { os, arch } = *self;