syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":".map(Self)"}]}
source_snippet:             .map(Self)
context_before:         rustc_abi::ExternAbi::from_str(s)
context_after:             .map_err(|_| format!("{s} is not a valid extern ABI"))