Auto merge of #1552 - RalfJung:rustup, r=RalfJung

rustup; make sure the generator moves even with smarter optimizations

rust-version

@@ -1 +1 @@
-7bdb5dee7bac15458b10b148e9e24968e633053e
+a3bc0e752fad96f537b73f4e9bc805a73d404f7b

tests/compile-fail/generator-pinned-moved.rs

@@ -34,10 +34,10 @@ fn next(&mut self) -> Option<Self::Item> {
 
 fn main() {
     let mut generator_iterator_2 = {
-        let mut generator_iterator = GeneratorIteratorAdapter(firstn());
+        let mut generator_iterator = Box::new(GeneratorIteratorAdapter(firstn()));
         generator_iterator.next(); // pin it
 
-        generator_iterator // move it
+        Box::new(*generator_iterator) // move it
     }; // *deallocate* generator_iterator
 
     generator_iterator_2.next(); // and use moved value

tests/compile-fail/storage_dead_dangling.rs

@@ -1,5 +1,5 @@
-// This should fail even without validation
-// compile-flags: -Zmiri-disable-validation
+// This should fail even without validation, but some MIR opts mask the error
+// compile-flags: -Zmiri-disable-validation -Zmir-opt-level=0
 
 static mut LEAK: usize = 0;
 

tests/compile-fail/validity/transmute_through_ptr.rs

@@ -1,4 +1,5 @@
 #[repr(u32)]
+#[derive(Debug)]
 enum Bool { True }
 
 fn evil(x: &mut Bool) {
@@ -9,6 +10,7 @@ fn evil(x: &mut Bool) {
 fn main() {
     let mut x = Bool::True;
     evil(&mut x);
-    let _y = x; // reading this ought to be enough to trigger validation
+    let y = x; // reading this ought to be enough to trigger validation
     //~^ ERROR encountered 0x0000002c at .<enum-tag>, but expected a valid enum tag
+    println!("{:?}", y); // make sure it is used (and not optimized away)
 }