Relocate tests in tests/ui

tests/ui/or-patterns/lazy-and-or.rs

@@ -0,0 +1,25 @@
+//@ run-pass
+// This test verifies the short-circuiting behavior of logical operators `||` and `&&`.
+// It ensures that the right-hand expression is not evaluated when the left-hand
+// expression is sufficient to determine the result.
+
+fn would_panic_if_called(x: &mut isize) -> bool {
+    *x += 1;
+    assert!(false, "This function should never be called due to short-circuiting");
+    false
+}
+
+fn main() {
+    let x = 1 == 2 || 3 == 3;
+    assert!(x);
+
+    let mut y: isize = 10;
+    println!("Result of short-circuit: {}", x || would_panic_if_called(&mut y));
+    assert_eq!(y, 10, "y should remain 10 if short-circuiting works correctly");
+
+    if true && x {
+        assert!(true);
+    } else {
+        assert!(false, "This branch should not be reached");
+    }
+}

tests/ui/recursion/recursive-enum-box.rs

@@ -0,0 +1,21 @@
+//@ run-pass
+// A smoke test for recursive enum structures using Box<T>.
+// This test constructs a linked list-like structure to exercise memory allocation and ownership.
+// Originally introduced in 2010, this is one of Rust’s earliest test cases.
+
+#![allow(dead_code)]
+
+enum List {
+    Cons(isize, Box<List>),
+    Nil,
+}
+
+fn main() {
+    List::Cons(
+        10,
+        Box::new(List::Cons(
+            11,
+            Box::new(List::Cons(12, Box::new(List::Nil))),
+        )),
+    );
+}

tests/ui/typeck/minus-string.rs

@@ -0,0 +1,7 @@
+// Regression test for issue #813.
+// This ensures that the unary negation operator `-` cannot be applied to an owned `String`.
+// Previously, due to a type-checking bug, this was mistakenly accepted by the compiler.
+
+fn main() {
+    -"foo".to_string(); //~ ERROR cannot apply unary operator `-` to type `String`
+}

tests/ui/minus-string.stderr → tests/ui/typeck/minus-string.stderr

@@ -1,8 +1,8 @@
 error[E0600]: cannot apply unary operator `-` to type `String`
-  --> $DIR/minus-string.rs:1:13
+  --> $DIR/minus-string.rs:6:5
    |
-LL | fn main() { -"foo".to_string(); }
-   |             ^^^^^^^^^^^^^^^^^^ cannot apply unary operator `-`
+LL |     -"foo".to_string();
+   |     ^^^^^^^^^^^^^^^^^^ cannot apply unary operator `-`
    |
 note: the foreign item type `String` doesn't implement `Neg`
   --> $SRC_DIR/alloc/src/string.rs:LL:COL