syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"assert_eq!(re,"}]}
source_snippet:                     assert_eq!(re, tcx.lifetimes.re_erased);
context_before:                 let ty = fold_regions(tcx, decl.ty, |re, debruijn| {
context_after:                     let var = ty::BoundVar::from_usize(vars.len());