{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"impl<'a>"}]}
impl<'a> From<(&'a hir::LetExpr<'a>, HirId)> for Declaration<'a> {
    fn from((let_expr, hir_id): (&'a hir::LetExpr<'a>, HirId)) -> Self {