syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"self.local_decls.push(LocalDecl::with_source_info(param.ty,"}]}
source_snippet:                 self.local_decls.push(LocalDecl::with_source_info(param.ty, source_info));
context_before:             let arg_local =