syntax_data: {"ast_node_type":"variable","tokens":[{"end":31,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let sp = node.span;
context_before:         &ExprKind::Literal { lit, neg } => {
context_after:             tcx.at(sp).lit_to_const(LitToConstInput { lit: lit.node, ty: node.ty, neg })