diff --git a/src/rcore.rs b/src/rcore.rs
index d669484..a33bab2 100644
--- a/src/rcore.rs
+++ b/src/rcore.rs
@@ -17,6 +17,7 @@ mod points;
 mod regular;
 mod resolution;
 mod resolver_origin;
+mod singular;
 mod topology;
 
 use std::{error::Error, sync::Arc};
@@ -41,6 +42,7 @@ pub use self::resolution::{
     Address, HashResolution, HashResolutionResult, LookupError, Resolution, ResolutionError,
     ResolutionFailure, ResolutionResult, Resolver, ResolverMap,
 };
+pub use self::singular::SingularResolution;
 pub use self::topology::MentionableTop;
 
 /// Helper alias for [`WeakFunctor::F`] of [`FunctorContext::T`].
diff --git a/src/rcore/singular.rs b/src/rcore/singular.rs
new file mode 100644
index 0000000..3bba249
--- /dev/null
+++ b/src/rcore/singular.rs
@@ -0,0 +1,7 @@
+use super::*;
+
+pub trait SingularResolution<'a, Ctx: Context<'a>>: 'a + Send + Sync {
+    fn singular(self: Arc<Self>) -> HashResolution<'a, Ctx>;
+
+    fn s_hash(&self) -> Hash;
+}
diff --git a/src/rstd/singular.rs b/src/rstd/singular.rs
index ed5a4ca..d96739f 100644
--- a/src/rstd/singular.rs
+++ b/src/rstd/singular.rs
@@ -1,14 +1,7 @@
 use crate::func::context::*;
-use crate::rcore::*;
 
 use super::*;
 
-trait SingularResolution<'a, Ctx: Context<'a>>: 'a + Send + Sync {
-    fn singular(self: Arc<Self>) -> HashResolution<'a, Ctx>;
-
-    fn s_hash(&self) -> Hash;
-}
-
 impl<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>> SingularResolution<'a, Ctx>
     for Point<'a, Ctx, A>
 {