diff --git a/src/rcore.rs b/src/rcore.rs
index eb02440..33b64c6 100644
--- a/src/rcore.rs
+++ b/src/rcore.rs
@@ -33,7 +33,7 @@ pub use self::hashing::{Hash, HASH_SIZE, HASH_ZEROS};
 pub use self::inctx::InCtx;
 pub use self::inlining::{Inlining, InliningExt, InliningResultExt};
 pub use self::modes::{
-    FactoryProxy, ParseMode, RegularFactory, RegularMode, WithMode, WithParseMode,
+    FactoryProxy, Mode, ParseMode, RegularFactory, RegularMode, WithMode, WithParseMode,
 };
 pub use self::origin::{OFctr, Origin};
 pub use self::point::Point;
diff --git a/src/rcore/modes.rs b/src/rcore/modes.rs
index 6156134..cf8eb40 100644
--- a/src/rcore/modes.rs
+++ b/src/rcore/modes.rs
@@ -2,8 +2,22 @@ use std::marker::PhantomData;
 
 use super::*;
 
+pub trait Mode {
+    type ParseResult<A, E, I>;
+
+    fn map_err<A, E0, E1, I>(
+        result: Self::ParseResult<A, E0, I>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ParseResult<A, E1, I>;
+
+    fn bind<A0, A1, E, I>(
+        result: Self::ParseResult<A0, E, I>,
+        f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ParseResult<A1, E, I>;
+}
+
 pub trait ParseMode {
-    type Mode: ?Sized;
+    type Mode: ?Sized + Mode;
 }
 
 pub trait WithParseMode: ParseMode {
@@ -49,6 +63,24 @@ where
 
 pub struct RegularMode;
 
+impl Mode for RegularMode {
+    type ParseResult<A, E, I> = Result<A, E>;
+
+    fn map_err<A, E0, E1, I>(
+        result: Self::ParseResult<A, E0, I>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ParseResult<A, E1, I> {
+        result.map_err(f)
+    }
+
+    fn bind<A0, A1, E, I>(
+        result: Self::ParseResult<A0, E, I>,
+        f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ParseResult<A1, E, I> {
+        result.and_then(f)
+    }
+}
+
 pub trait RegularFactory<'a, Ctx: Context<'a>>:
     FactoryBase<'a, Ctx> + ParseMode<Mode = RegularMode>
 {
diff --git a/src/rstd/inlining/modes.rs b/src/rstd/inlining/modes.rs
index decb4ac..7ac123b 100644
--- a/src/rstd/inlining/modes.rs
+++ b/src/rstd/inlining/modes.rs
@@ -2,6 +2,26 @@ use super::*;
 
 pub struct InliningMode;
 
+impl Mode for InliningMode {
+    type ParseResult<A, E, I> = Result<(A, I), E>;
+
+    fn map_err<A, E0, E1, I>(
+        result: Self::ParseResult<A, E0, I>,
+        f: impl FnOnce(E0) -> E1,
+    ) -> Self::ParseResult<A, E1, I> {
+        result.map_err(f)
+    }
+
+    fn bind<A0, A1, E, I>(
+        result: Self::ParseResult<A0, E, I>,
+        f: impl FnOnce(A0) -> Result<A1, E>,
+    ) -> Self::ParseResult<A1, E, I> {
+        let (a0, i) = result?;
+        let a1 = f(a0)?;
+        Ok((a1, i))
+    }
+}
+
 impl<'a, Ctx: Context<'a>, F: InlineableFactory<'a, Ctx>> FactoryProxy<'a, Ctx>
     for WithMode<F, InliningMode>
 {