diff --git a/sub/core/src/lib.rs b/sub/core/src/lib.rs
index 8e7e311..0d48965 100644
--- a/sub/core/src/lib.rs
+++ b/sub/core/src/lib.rs
@@ -1,4 +1,6 @@
-#![no_std] #![feature(decl_macro)] #![allow(unused)]
+#![no_std] #![feature(decl_macro)]
+#![feature(inherent_associated_types)]
+#![allow(unused, incomplete_features)]
 
 
 //
@@ -22,6 +24,7 @@ pub mod fnv1;
 pub mod pstruct;
 pub mod align;
 
+pub mod never;
 //
 // Export Preludes:
 //
@@ -53,6 +56,7 @@ pub mod prelude {
     pub use crate::pstruct::struct_offset;
     pub use crate::pod::{Pod,Mut};
     pub use crate::align::Align;
+    pub use crate::never::Never;
 }
 
 pub mod public {
diff --git a/sub/core/src/never.rs b/sub/core/src/never.rs
new file mode 100644
index 0000000..34e8e75
--- /dev/null
+++ b/sub/core/src/never.rs
@@ -0,0 +1,9 @@
+
+pub type Never = <fn()->! as Ret>::Ret;
+
+trait Ret { type Ret; }
+impl<R> Ret for fn() -> R {
+    type Ret=R;
+}
+
+
diff --git a/x/tests/test_core.rs b/x/tests/test_core.rs
deleted file mode 100644
index 57ea7ed..0000000
--- a/x/tests/test_core.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-
-#[test]
-pub fn test_once() {
-    let mut i = 0;
-    for _ in 0..3 {
-        if x::once!() { i+= 1; }
-        if x::once!() { i+= 1; }
-    }
-    assert_eq!(i, 2);
-}
-
-
-
-#[test]
-pub fn test_chain() {
-    let a = 0x1337;
-    let b = [None,None,Some(&a)];
-    let c = [None,Some(&b), None];
-    assert_eq!(0x1337, x::ptr_chain!(&c as *const _, 0x8, 0x10, 0x0));
-}
-
diff --git a/x/tests/test_xpat.rs b/x/tests/test_xpat.rs
deleted file mode 100644
index 2b6a1b4..0000000
--- a/x/tests/test_xpat.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-
-
-
-#[test]
-pub fn test_pattern() {
-
-    let pattern = x::pattern!("E8 ( AA | CC | DD ) E8 ");
-    use x::xpat::Atom::*;
-    let pattern = &[Save(0), Byte(0xE8),
-        Case(2), Byte(0xCC), Break(8), 
-        Case(2), Byte(0xAA), Break(5), 
-        Case(2), Byte(0xCC), Break(2), Nop, Byte(0xDD), Byte(0xE8)];
-    let buffer: &[u8] = &[ 0xE8, 0xDD, 0xE8 ];
-
-    let mut scanner = x::Scanner::new(buffer, pattern, ..);
-    let mut saves = [0usize;8];
-
-    assert!(scanner.next(&mut saves));
-}