syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let ty = cx.tcx().erase_regions(ty);
context_before:         use rustc_middle::ty::layout::LayoutOf;
context_after:         cx.layout_of(ty).map(|tl| tl.layout)