syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"&&"}]}
source_snippet:                         && lhs_sig_tys.len() == rhs_sig_tys.len()
context_before:                     lhs_hdr == rhs_hdr
context_after:                         && iter::zip(lhs_sig_tys.iter(), rhs_sig_tys.iter())