syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let value = recurse_build(tcx, body, source, root_span)?;
context_before:             let value_ty = body.exprs[source].ty;
context_after:             ty::Const::new_expr(tcx, Expr::new_cast(tcx, CastKind::As, value_ty, value, node.ty))