syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"(self.map_bound(|sig|"}]}
source_snippet:         (self.map_bound(|sig| FnSigTys { inputs_and_output: sig.inputs_and_output }), hdr)
context_before:             FnHeader { c_variadic: self.c_variadic(), safety: self.safety(), abi: self.abi() };
context_after:     }