diff --git a/src/lib.rs b/src/lib.rs
index 128b338f943d..50b1305e52c8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -44,8 +44,12 @@ use range_map::RangeMap;
 #[allow(unused_imports)] // FIXME rustc bug https://github.com/rust-lang/rust/issues/53682
 use helpers::{ScalarExt, EvalContextExt as HelpersEvalContextExt};
 use mono_hash_map::MonoHashMap;
-use stacked_borrows::{EvalContextExt as StackedBorEvalContextExt, Borrow};
+use stacked_borrows::{EvalContextExt as StackedBorEvalContextExt};
 
+// Used by priroda
+pub use stacked_borrows::{Borrow, Stacks, Mut as MutBorrow};
+
+// Used by priroda
 pub fn create_ecx<'a, 'mir: 'a, 'tcx: 'mir>(
     tcx: TyCtxt<'a, 'tcx, 'tcx>,
     main_id: DefId,
diff --git a/src/stacked_borrows.rs b/src/stacked_borrows.rs
index f634f17109c7..96ae2aa5c576 100644
--- a/src/stacked_borrows.rs
+++ b/src/stacked_borrows.rs
@@ -21,12 +21,20 @@ pub enum Mut {
 
 impl Mut {
     #[inline(always)]
-    fn is_raw(self) -> bool {
+    pub fn is_raw(self) -> bool {
         match self {
             Mut::Raw => true,
             _ => false,
         }
     }
+
+    #[inline(always)]
+    pub fn is_uniq(self) -> bool {
+        match self {
+            Mut::Uniq(_) => true,
+            _ => false,
+        }
+    }
 }
 
 /// Information about any kind of borrow
@@ -40,9 +48,17 @@ pub enum Borrow {
 
 impl Borrow {
     #[inline(always)]
-    fn is_uniq(self) -> bool {
+    pub fn is_uniq(self) -> bool {
         match self {
-            Borrow::Mut(Mut::Uniq(_)) => true,
+            Borrow::Mut(m) => m.is_uniq(),
+            _ => false,
+        }
+    }
+
+    #[inline(always)]
+    pub fn is_frz(self) -> bool {
+        match self {
+            Borrow::Frz(_) => true,
             _ => false,
         }
     }