diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index 036b836..da51b34 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -18,6 +18,16 @@ pub trait Mode {
     ) -> Self::ParseResult<A1, E, I>;
 
     fn seal<A, E, I>(result: Self::ParseResult<A, E, I>) -> Result<A, E>;
+
+    fn xmap_err<A, E0, E1>(
+        result: Self::ExtensionResult<A, E0>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ExtensionResult<A, E1>;
+
+    fn xbind<A0, A1, E>(
+        result: Self::ExtensionResult<A0, E>,
+        f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ExtensionResult<A1, E>;
 }
 
 pub trait ParseMode {
@@ -89,6 +99,20 @@ impl Mode for RegularMode {
     fn seal<A, E, I>(result: Self::ParseResult<A, E, I>) -> Result<A, E> {
         result
     }
+
+    fn xmap_err<A, E0, E1>(
+        result: Self::ExtensionResult<A, E0>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ExtensionResult<A, E1> {
+        result.map_err(f)
+    }
+
+    fn xbind<A0, A1, E>(
+        result: Self::ExtensionResult<A0, E>,
+        f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ExtensionResult<A1, E> {
+        result.and_then(f)
+    }
 }
 
 pub trait RegularFactory<'a, Ctx: Context<'a>>:
diff --git a/src/rstd/inlining/modes.rs b/src/rstd/inlining/modes.rs
index c6dbbcb..ce7ce18 100644
--- a/src/rstd/inlining/modes.rs
+++ b/src/rstd/inlining/modes.rs
@@ -26,6 +26,20 @@ impl Mode for InliningMode {
     fn seal<A, E, I>(result: Self::ParseResult<A, E, I>) -> Result<A, E> {
         result.map(|(a, _)| a)
     }
+
+    fn xmap_err<A, E0, E1>(
+        result: Self::ExtensionResult<A, E0>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ExtensionResult<A, E1> {
+        f(result)
+    }
+
+    fn xbind<A0, A1, E>(
+        result: Self::ExtensionResult<A0, E>,
+        _f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ExtensionResult<A1, E> {
+        result
+    }
 }
 
 impl<'a, Ctx: Context<'a>, F: InlineableFactory<'a, Ctx>> FactoryProxy<'a, Ctx>