diff --git a/lang/tests/shared/shared.rs b/lang/tests/shared/shared.rs
index ce87f4c..091e770 100644
--- a/lang/tests/shared/shared.rs
+++ b/lang/tests/shared/shared.rs
@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 #[unsafe(no_mangle)]
 extern "C" fn panic() -> ! {
     panic!("Called panic from external code.");
@@ -31,10 +33,297 @@ impl MaybeFFISlice {
 }
 
 impl FFISlice {
-    pub fn as_slice(&self) -> &[u8] {
+    pub unsafe fn as_slice<T: Sized>(&self) -> &[T] {
+        unsafe { core::slice::from_raw_parts(self.ptr.cast(), self.len) }
+    }
+    pub unsafe fn as_bytes(&self) -> &[u8] {
         unsafe { core::slice::from_raw_parts(self.ptr, self.len) }
     }
-    pub fn as_str(&self) -> &str {
-        unsafe { core::str::from_utf8_unchecked(self.as_slice()) }
+    pub unsafe fn as_str(&self) -> &str {
+        unsafe { core::str::from_utf8_unchecked(self.as_bytes()) }
+    }
+}
+
+#[repr(C)]
+pub struct BlobVec {
+    pub data: *mut u8,
+    pub len: usize,
+    pub cap: usize,
+    pub elem_size: usize,
+    pub drop: Option<extern "C" fn(*mut u8)>,
+}
+
+impl Default for BlobVec {
+    fn default() -> Self {
+        Self {
+            data: core::ptr::null_mut(),
+            len: 0,
+            cap: 0,
+            elem_size: 0,
+            drop: None,
+        }
+    }
+}
+
+unsafe impl Send for BlobVec {}
+unsafe impl Sync for BlobVec {}
+
+pub mod vec {
+    #![allow(dead_code)]
+
+    use super::ffi::*;
+    use super::*;
+
+    pub struct Vec<T> {
+        pub vec: BlobVec,
+        _marker: core::marker::PhantomData<T>,
+    }
+
+    impl<T> Vec<T> {
+        pub fn new() -> Self {
+            Self::new_with(32)
+        }
+
+        pub fn new_with(capacity: usize) -> Self {
+            let mut vec = BlobVec {
+                data: core::ptr::null_mut(),
+                len: 0,
+                cap: 0,
+                elem_size: 0,
+                drop: None,
+            };
+
+            extern "C" fn drop_fn<T>(ptr: *mut u8) {
+                unsafe {
+                    core::ptr::drop_in_place::<T>(ptr as *mut T);
+                }
+            }
+
+            unsafe {
+                vec_init_with(
+                    &mut vec,
+                    core::mem::size_of::<T>(),
+                    Some(drop_fn::<T>),
+                    capacity,
+                );
+            }
+
+            Self {
+                vec,
+                _marker: core::marker::PhantomData,
+            }
+        }
+
+        pub fn as_slice(&self) -> &[T] {
+            assert_eq!(self.vec.elem_size, core::mem::size_of::<T>());
+            unsafe { core::slice::from_raw_parts(self.vec.data as *const T, self.vec.len) }
+        }
+
+        pub fn as_slice_mut(&mut self) -> &mut [T] {
+            assert_eq!(self.vec.elem_size, core::mem::size_of::<T>());
+            unsafe { core::slice::from_raw_parts_mut(self.vec.data as *mut T, self.vec.len) }
+        }
+
+        pub fn push(&mut self, value: T) {
+            let value = core::mem::ManuallyDrop::new(value);
+            unsafe {
+                vec_push(&mut self.vec, &raw const value as *const T as *const u8);
+            }
+        }
+
+        pub fn insert(&mut self, value: T, index: usize) {
+            if index > self.vec.len {
+                return;
+            }
+            let value = core::mem::ManuallyDrop::new(value);
+            unsafe {
+                vec_insert(
+                    &mut self.vec,
+                    index,
+                    &raw const value as *const T as *const u8,
+                );
+            }
+        }
+
+        pub fn pop(&mut self) -> Option<T> {
+            if self.vec.len == 0 {
+                return None;
+            }
+            unsafe {
+                let ptr = vec_get(&mut self.vec, self.vec.len - 1) as *mut T;
+                let value = ptr.read();
+                vec_pop(&mut self.vec);
+                Some(value)
+            }
+        }
+
+        pub fn get(&self, index: usize) -> Option<&T> {
+            if index >= self.vec.len {
+                return None;
+            }
+            unsafe {
+                let ptr = vec_get(&raw const self.vec as *mut _, index) as *mut T;
+                Some(&*ptr)
+            }
+        }
+
+        pub fn get_mut(&mut self, index: usize) -> Option<&mut T> {
+            if index >= self.vec.len {
+                return None;
+            }
+            unsafe {
+                let ptr = vec_get(&raw mut self.vec, index) as *mut T;
+                Some(&mut *ptr)
+            }
+        }
+
+        pub fn remove(&mut self, index: usize) {
+            if index >= self.vec.len {
+                return;
+            }
+            unsafe {
+                vec_remove(&mut self.vec, index);
+            }
+        }
+
+        pub fn len(&self) -> usize {
+            self.vec.len
+        }
+
+        pub fn position<F>(&self, elem: &T, mut cmp: F) -> Option<usize>
+        where
+            F: FnMut(&T, &T) -> bool,
+        {
+            extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> bool>(
+                f: *const (),
+                a: *const u8,
+                b: *const u8,
+            ) -> bool {
+                let f = unsafe { &mut *(f as *mut F) };
+                let a = unsafe { &*(a as *const T) };
+                let b = unsafe { &*(b as *const T) };
+                f(a, b)
+            }
+
+            unsafe {
+                let index = vec_find(
+                    &raw const self.vec as *mut _,
+                    elem as *const T as *const u8,
+                    cmp_trampoline::<T, F>,
+                    &raw mut cmp as *mut F as *mut (),
+                );
+                if index == usize::MAX {
+                    None
+                } else {
+                    Some(index)
+                }
+            }
+        }
+
+        pub fn binary_search_by<F>(&self, elem: &T, mut cmp: F) -> Result<usize, usize>
+        where
+            F: FnMut(&T, &T) -> i32,
+        {
+            extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> i32>(
+                f: *const (),
+                a: *const u8,
+                b: *const u8,
+            ) -> i32 {
+                let f = unsafe { &mut *(f as *mut F) };
+                let a = unsafe { &*(a as *const T) };
+                let b = unsafe { &*(b as *const T) };
+                f(a, b)
+            }
+
+            unsafe {
+                let (index, vacant) = vec_binary_search_by(
+                    &raw const self.vec as *mut _,
+                    elem as *const T as *const u8,
+                    cmp_trampoline::<T, F>,
+                    &raw mut cmp as *mut F as *mut (),
+                );
+                if vacant {
+                    Err(index)
+                } else {
+                    Ok(index)
+                }
+            }
+        }
+
+        pub fn insert_sorted<F>(&self, elem: T, mut cmp: F) -> Result<usize, usize>
+        where
+            F: FnMut(&T, &T) -> i32,
+        {
+            extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> i32>(
+                f: *const (),
+                a: *const u8,
+                b: *const u8,
+            ) -> i32 {
+                let f = unsafe { &mut *(f as *mut F) };
+                let a = unsafe { &*(a as *const T) };
+                let b = unsafe { &*(b as *const T) };
+                f(a, b)
+            }
+
+            let mut elem = core::mem::ManuallyDrop::new(elem);
+
+            unsafe {
+                let (index, _inserted) = vec_insert_sorted(
+                    &raw const self.vec as *mut _,
+                    &raw mut elem as *const u8,
+                    cmp_trampoline::<T, F>,
+                    &raw mut cmp as *mut F as *mut (),
+                );
+                Ok(index)
+            }
+        }
+    }
+}
+
+pub mod ffi {
+    #![allow(improper_ctypes)]
+    use super::*;
+
+    #[allow(dead_code)]
+    unsafe extern "C" {
+        pub unsafe fn vec_init(
+            vec: *mut BlobVec,
+            elem_size: usize,
+            drop: Option<extern "C" fn(*mut u8)>,
+        );
+        pub unsafe fn vec_init_with(
+            vec: *mut BlobVec,
+            elem_size: usize,
+            drop: Option<extern "C" fn(*mut u8)>,
+            cap: usize,
+        );
+        pub unsafe fn vec_push(vec: *mut BlobVec, elem: *const u8);
+        pub unsafe fn vec_insert(vec: *mut BlobVec, index: usize, elem: *const u8);
+        pub unsafe fn vec_pop(vec: *mut BlobVec);
+        pub unsafe fn vec_drop_last(vec: *mut BlobVec);
+        pub unsafe fn vec_get(vec: *mut BlobVec, index: usize) -> *mut u8;
+
+        pub unsafe fn vec_remove(vec: *mut BlobVec, index: usize);
+        pub unsafe fn vec_drop(vec: *mut BlobVec);
+
+        pub unsafe fn vec_find(
+            vec: *mut BlobVec,
+            elem: *const u8,
+            cmp: extern "C" fn(*const (), *const u8, *const u8) -> bool,
+            cmp_data: *mut (),
+        ) -> usize;
+
+        pub unsafe fn vec_binary_search_by(
+            vec: *mut BlobVec,
+            elem: *const u8,
+            cmp: extern "C" fn(*const (), *const u8, *const u8) -> i32,
+            cmp_data: *mut (),
+        ) -> (usize, bool);
+        pub unsafe fn vec_insert_sorted(
+            vec: *mut BlobVec,
+            elem: *const u8,
+            cmp: extern "C" fn(*const (), *const u8, *const u8) -> i32,
+            cmp_data: *mut (),
+        ) -> (usize, bool);
     }
 }
diff --git a/lang/tests/tokens.rs b/lang/tests/tokens.rs
index 8c594cb..c96102b 100644
--- a/lang/tests/tokens.rs
+++ b/lang/tests/tokens.rs
@@ -18,12 +18,6 @@ impl PartialEq for Lexeme {
 
 impl Eq for Lexeme {}
 
-impl Lexeme {
-    fn lex(&self) -> &'static str {
-        self.1
-    }
-}
-
 trait AsLexeme {
     fn as_lexeme(self) -> Option<Lexeme>;
 }
diff --git a/lang/tests/vec.rs b/lang/tests/vec.rs
index 282b53f..8c83d0f 100644
--- a/lang/tests/vec.rs
+++ b/lang/tests/vec.rs
@@ -1,263 +1,7 @@
-#[repr(C)]
-pub struct BlobVec {
-    pub data: *mut u8,
-    pub len: usize,
-    pub cap: usize,
-    pub elem_size: usize,
-    pub drop: Option<extern "C" fn(*mut u8)>,
-}
+#[path = "shared/shared.rs"]
+mod util;
 
-struct VecT<T> {
-    vec: BlobVec,
-    _marker: core::marker::PhantomData<T>,
-}
-
-impl<T> VecT<T> {
-    fn new() -> Self {
-        Self::new_with(32)
-    }
-
-    fn new_with(capacity: usize) -> Self {
-        let mut vec = BlobVec {
-            data: core::ptr::null_mut(),
-            len: 0,
-            cap: 0,
-            elem_size: 0,
-            drop: None,
-        };
-
-        extern "C" fn drop_fn<T>(ptr: *mut u8) {
-            unsafe {
-                core::ptr::drop_in_place::<T>(ptr as *mut T);
-            }
-        }
-
-        unsafe {
-            vec_init_with(
-                &mut vec,
-                core::mem::size_of::<T>(),
-                Some(drop_fn::<T>),
-                capacity,
-            );
-        }
-
-        Self {
-            vec,
-            _marker: core::marker::PhantomData,
-        }
-    }
-
-    fn as_slice(&self) -> &[T] {
-        assert_eq!(self.vec.elem_size, core::mem::size_of::<T>());
-        unsafe { core::slice::from_raw_parts(self.vec.data as *const T, self.vec.len) }
-    }
-
-    fn as_slice_mut(&mut self) -> &mut [T] {
-        assert_eq!(self.vec.elem_size, core::mem::size_of::<T>());
-        unsafe { core::slice::from_raw_parts_mut(self.vec.data as *mut T, self.vec.len) }
-    }
-
-    fn push(&mut self, value: T) {
-        let value = core::mem::ManuallyDrop::new(value);
-        unsafe {
-            vec_push(&mut self.vec, &raw const value as *const T as *const u8);
-        }
-    }
-
-    fn insert(&mut self, value: T, index: usize) {
-        if index > self.vec.len {
-            return;
-        }
-        let value = core::mem::ManuallyDrop::new(value);
-        unsafe {
-            vec_insert(
-                &mut self.vec,
-                index,
-                &raw const value as *const T as *const u8,
-            );
-        }
-    }
-
-    fn pop(&mut self) -> Option<T> {
-        if self.vec.len == 0 {
-            return None;
-        }
-        unsafe {
-            let ptr = vec_get(&mut self.vec, self.vec.len - 1) as *mut T;
-            let value = ptr.read();
-            vec_pop(&mut self.vec);
-            Some(value)
-        }
-    }
-
-    fn get(&self, index: usize) -> Option<&T> {
-        if index >= self.vec.len {
-            return None;
-        }
-        unsafe {
-            let ptr = vec_get(&raw const self.vec as *mut _, index) as *mut T;
-            Some(&*ptr)
-        }
-    }
-    fn get_mut(&mut self, index: usize) -> Option<&mut T> {
-        if index >= self.vec.len {
-            return None;
-        }
-        unsafe {
-            let ptr = vec_get(&raw mut self.vec, index) as *mut T;
-            Some(&mut *ptr)
-        }
-    }
-
-    fn remove(&mut self, index: usize) {
-        if index >= self.vec.len {
-            return;
-        }
-        unsafe {
-            vec_remove(&mut self.vec, index);
-        }
-    }
-
-    fn len(&self) -> usize {
-        self.vec.len
-    }
-
-    fn position<F>(&self, elem: &T, mut cmp: F) -> Option<usize>
-    where
-        F: FnMut(&T, &T) -> bool,
-    {
-        extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> bool>(
-            f: *const (),
-            a: *const u8,
-            b: *const u8,
-        ) -> bool {
-            let f = unsafe { &mut *(f as *mut F) };
-            let a = unsafe { &*(a as *const T) };
-            let b = unsafe { &*(b as *const T) };
-            f(a, b)
-        }
-
-        unsafe {
-            let index = vec_find(
-                &raw const self.vec as *mut _,
-                elem as *const T as *const u8,
-                cmp_trampoline::<T, F>,
-                &raw mut cmp as *mut F as *mut (),
-            );
-            if index == usize::MAX {
-                None
-            } else {
-                Some(index)
-            }
-        }
-    }
-
-    fn binary_search_by<F>(&self, elem: &T, mut cmp: F) -> Result<usize, usize>
-    where
-        F: FnMut(&T, &T) -> i32,
-    {
-        extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> i32>(
-            f: *const (),
-            a: *const u8,
-            b: *const u8,
-        ) -> i32 {
-            let f = unsafe { &mut *(f as *mut F) };
-            let a = unsafe { &*(a as *const T) };
-            let b = unsafe { &*(b as *const T) };
-            f(a, b)
-        }
-
-        unsafe {
-            let (index, vacant) = vec_binary_search_by(
-                &raw const self.vec as *mut _,
-                elem as *const T as *const u8,
-                cmp_trampoline::<T, F>,
-                &raw mut cmp as *mut F as *mut (),
-            );
-            if vacant {
-                Err(index)
-            } else {
-                Ok(index)
-            }
-        }
-    }
-
-    fn insert_sorted<F>(&self, elem: T, mut cmp: F) -> Result<usize, usize>
-    where
-        F: FnMut(&T, &T) -> i32,
-    {
-        extern "C" fn cmp_trampoline<T, F: FnMut(&T, &T) -> i32>(
-            f: *const (),
-            a: *const u8,
-            b: *const u8,
-        ) -> i32 {
-            let f = unsafe { &mut *(f as *mut F) };
-            let a = unsafe { &*(a as *const T) };
-            let b = unsafe { &*(b as *const T) };
-            f(a, b)
-        }
-
-        let mut elem = core::mem::ManuallyDrop::new(elem);
-
-        unsafe {
-            let (index, inserted) = vec_insert_sorted(
-                &raw const self.vec as *mut _,
-                &raw const elem as *const u8,
-                cmp_trampoline::<T, F>,
-                &raw mut cmp as *mut F as *mut (),
-            );
-            Ok(index)
-        }
-    }
-}
-
-#[unsafe(no_mangle)]
-extern "C" fn panic() -> ! {
-    panic!("Called panic from external code.");
-}
-
-unsafe impl Send for BlobVec {}
-unsafe impl Sync for BlobVec {}
-
-unsafe extern "C" {
-    unsafe fn vec_init(vec: *mut BlobVec, elem_size: usize, drop: Option<extern "C" fn(*mut u8)>);
-    unsafe fn vec_init_with(
-        vec: *mut BlobVec,
-        elem_size: usize,
-        drop: Option<extern "C" fn(*mut u8)>,
-        cap: usize,
-    );
-    unsafe fn vec_push(vec: *mut BlobVec, elem: *const u8);
-    unsafe fn vec_insert(vec: *mut BlobVec, index: usize, elem: *const u8);
-    unsafe fn vec_pop(vec: *mut BlobVec);
-    unsafe fn vec_drop_last(vec: *mut BlobVec);
-    unsafe fn vec_get(vec: *mut BlobVec, index: usize) -> *mut u8;
-
-    #[allow(dead_code)]
-    unsafe fn vec_remove(vec: *mut BlobVec, index: usize);
-    #[allow(dead_code)]
-    unsafe fn vec_drop(vec: *mut BlobVec);
-
-    unsafe fn vec_find(
-        vec: *mut BlobVec,
-        elem: *const u8,
-        cmp: extern "C" fn(*const (), *const u8, *const u8) -> bool,
-        cmp_data: *mut (),
-    ) -> usize;
-
-    unsafe fn vec_binary_search_by(
-        vec: *mut BlobVec,
-        elem: *const u8,
-        cmp: extern "C" fn(*const (), *const u8, *const u8) -> i32,
-        cmp_data: *mut (),
-    ) -> (usize, bool);
-    unsafe fn vec_insert_sorted(
-        vec: *mut BlobVec,
-        elem: *const u8,
-        cmp: extern "C" fn(*const (), *const u8, *const u8) -> i32,
-        cmp_data: *mut (),
-    ) -> (usize, bool);
-}
+use util::{ffi::*, vec::Vec, BlobVec};
 
 fn main() {
     static mut DROPS: usize = 1;
@@ -318,7 +62,7 @@ fn main() {
         eprintln!("Push/pop test passed\n");
     }
 
-    let mut vec = VecT::<u32>::new_with(100);
+    let mut vec = Vec::<u32>::new_with(100);
     assert_eq!(vec.len(), 0);
     vec.push(10);
     vec.push(20);
@@ -358,6 +102,6 @@ fn main() {
     assert_eq!(vec.binary_search_by(&5, cmp), Err(0));
     assert_eq!(vec.binary_search_by(&55, cmp), Err(4));
 
-    vec.insert_sorted(35, cmp);
+    _ = vec.insert_sorted(35, cmp);
     assert_eq!(vec.as_slice(), &[20, 30, 35, 40, 50]);
 }