Add new ui tests

Author: saethlin

src/tools/tidy/src/ui_tests.rs

@@ -15,7 +15,7 @@ use std::path::{Path, PathBuf};
 const ENTRY_LIMIT: usize = 900;
 // FIXME: The following limits should be reduced eventually.
 const ISSUES_ENTRY_LIMIT: usize = 1819;
-const ROOT_ENTRY_LIMIT: usize = 871;
+const ROOT_ENTRY_LIMIT: usize = 872;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files

tests/ui/precondition-checks/misaligned-slice.rs

@@ -0,0 +1,11 @@
+// run-fail
+// compile-flags: -Copt-level=3 -Cdebug-assertions=yes
+// error-pattern: unsafe precondition(s) violated: slice::from_raw_parts
+// ignore-debug
+// ignore-wasm32-bare no panic messages
+
+fn main() {
+    unsafe {
+        let _s: &[u64] = std::slice::from_raw_parts(1usize as *const u64, 0);
+    }
+}

tests/ui/precondition-checks/null-slice.rs

@@ -0,0 +1,11 @@
+// run-fail
+// compile-flags: -Copt-level=3 -Cdebug-assertions=yes
+// error-pattern: unsafe precondition(s) violated: slice::from_raw_parts
+// ignore-debug
+// ignore-wasm32-bare no panic messages
+
+fn main() {
+    unsafe {
+        let _s: &[u8] = std::slice::from_raw_parts(std::ptr::null(), 0);
+    }
+}

tests/ui/precondition-checks/out-of-bounds-get-unchecked.rs

@@ -0,0 +1,12 @@
+// run-fail
+// compile-flags: -Copt-level=3 -Cdebug-assertions=yes
+// error-pattern: unsafe precondition(s) violated: hint::assert_unchecked
+// ignore-debug
+// ignore-wasm32-bare no panic messages
+
+fn main() {
+    unsafe {
+        let sli: &[u8] = &[0];
+        sli.get_unchecked(1);
+    }
+}