{"ast_node_type":"function","tokens":[{"end":50,"kind":"keyword","start":0,"text":"fn"}]}
    fn from(local: &'a hir::LetStmt<'a>) -> Self {
impl<'a> From<&'a hir::LetStmt<'a>> for Declaration<'a> {
        let hir::LetStmt { hir_id, super_: _, pat, ty, span, init, els, source: _ } = *local;