syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:     match (impl_polarity, other_polarity) {
context_before:     let other_polarity = tcx.impl_polarity(overlap.with_impl);
context_after:         (ty::ImplPolarity::Negative, ty::ImplPolarity::Positive) => {