cleaned up some tests

Author: Kivooeo

tests/ui/char.rs

@@ -0,0 +1,33 @@
+//! Check that temporaries in the for into-iterable expr are not dropped
+//! until the end of the for expr.
+
+//@ run-pass
+
+static mut FLAGS: u64 = 0;
+
+struct AddFlags {
+    bits: u64,
+}
+
+impl Drop for AddFlags {
+    fn drop(&mut self) {
+        unsafe {
+            FLAGS += self.bits;
+        }
+    }
+}
+
+fn check_flags(expected: u64) {
+    unsafe {
+        let actual = FLAGS;
+        FLAGS = 0;
+        assert_eq!(actual, expected, "flags {}, expected {}", actual, expected);
+    }
+}
+
+fn main() {
+    for _ in &[AddFlags { bits: 1 }] {
+        check_flags(0);
+    }
+    check_flags(1);
+}

tests/ui/class-cast-to-trait.rs

@@ -1,3 +1,7 @@
+//! Check that trying to cast an enum with a Drop impl to an integer is rejected.
+//!
+//! Issue: <https://github.com/rust-lang/rust/issues/35941>
+
 enum E {
     A = 0,
 }

tests/ui/class-cast-to-trait.stderr

@@ -1,5 +1,5 @@
 error: cannot cast enum `E` into integer `u32` because it implements `Drop`
-  --> $DIR/cenum_impl_drop_cast.rs:13:13
+  --> $DIR/enum-drop-cast-error.rs:17:13
    |
 LL |     let i = e as u32;
    |             ^^^^^^^^

tests/ui/class-method-missing.rs

@@ -0,0 +1,20 @@
+//! Trait objects only allow access to methods defined in the trait.
+
+trait MyTrait {
+    fn trait_method(&mut self);
+}
+
+struct ImplType;
+
+impl MyTrait for ImplType {
+    fn trait_method(&mut self) {}
+}
+
+impl ImplType {
+    fn struct_impl_method(&mut self) {}
+}
+
+fn main() {
+    let obj: Box<dyn MyTrait> = Box::new(ImplType);
+    obj.struct_impl_method(); //~ ERROR no method named `struct_impl_method` found
+}