syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let other_polarity = tcx.impl_polarity(overlap.with_impl);
context_before:     let impl_polarity = tcx.impl_polarity(impl_def_id.to_def_id());
context_after:     match (impl_polarity, other_polarity) {