{"ast_node_type":"variable","tokens":[{"end":33,"kind":"keyword","start":0,"text":"let"}]}
    let ast_lit = lit.literal()?;
fn pat_literal_to_hir(lit: &ast::LiteralPat) -> Option<(Literal, ast::Literal)> {
    let mut hir_lit: Literal = ast_lit.kind().into();