syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let pat = (*self).clone().fold_with(folder);
context_before:     fn fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, folder: &mut F) -> Self {
context_after:         if pat == *self { self } else { folder.cx().mk_pat(pat) }