move test to intergrated test in library/core

Author: tesuji

library/core/tests/intrinsics.rs

@@ -1,4 +1,5 @@
 use core::any::TypeId;
+use core::intrinsics::assume;
 
 #[test]
 fn test_typeid_sized_types() {
@@ -20,3 +21,17 @@ fn test_typeid_unsized_types() {
     assert_eq!(TypeId::of::<Y>(), TypeId::of::<Y>());
     assert!(TypeId::of::<X>() != TypeId::of::<Y>());
 }
+
+// Check that `const_assume` feature allow `assume` intrinsic
+// to be used in const contexts.
+#[test]
+fn test_assume_can_be_in_const_contexts() {
+    const unsafe fn foo(x: usize, y: usize) -> usize {
+        // SAFETY: the entire function is not safe,
+        // but it is just an example not used elsewhere.
+        unsafe { assume(y != 0) };
+        x / y
+    }
+    let rs = unsafe { foo(42, 97) };
+    assert_eq!(rs, 0);
+}

library/core/tests/lib.rs

@@ -7,6 +7,8 @@
 #![feature(bound_cloned)]
 #![feature(box_syntax)]
 #![feature(cell_update)]
+#![feature(const_assume)]
+#![feature(core_intrinsics)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]
 #![feature(debug_non_exhaustive)]