syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let trait_ref = overlap.impl_header.trait_ref.unwrap();
context_before:             let create_overlap_error = |overlap: traits::coherence::OverlapResult<'tcx>| {
context_after:                 let self_ty = trait_ref.self_ty();