syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"Ty::new_ref(cx.tcx,"}]}
source_snippet:                     Ty::new_ref(cx.tcx, cx.tcx.lifetimes.re_erased, subpattern.ty, mutability),
context_before:                 let temp = cx.temp(
context_after:                     pattern.span,