Revert "Fix tests broken by std::vec::SetLenOnDrop."

This reverts commit 366c793306.

tests/run-pass/heap.rs

@@ -11,25 +11,20 @@ fn make_box_syntax() -> Box<(i16, i16)> {
 fn allocate_reallocate() {
     let mut s = String::new();
 
-    // 4 byte heap alloc (__rust_allocate)
-    s.push('f');
-    assert_eq!(s.len(), 1);
-    assert_eq!(s.capacity(), 4);
+    // 6 byte heap alloc (__rust_allocate)
+    s.push_str("foobar");
+    assert_eq!(s.len(), 6);
+    assert_eq!(s.capacity(), 6);
 
-    // heap size doubled to 8 (__rust_reallocate)
-    // FIXME: String::push_str is broken because it hits the std::vec::SetLenOnDrop code and we
-    // don't call destructors in miri yet.
-    s.push('o');
-    s.push('o');
-    s.push('o');
-    s.push('o');
-    assert_eq!(s.len(), 5);
-    assert_eq!(s.capacity(), 8);
+    // heap size doubled to 12 (__rust_reallocate)
+    s.push_str("baz");
+    assert_eq!(s.len(), 9);
+    assert_eq!(s.capacity(), 12);
 
-    // heap size reduced to 5 (__rust_reallocate)
+    // heap size reduced to 9  (__rust_reallocate)
     s.shrink_to_fit();
-    assert_eq!(s.len(), 5);
-    assert_eq!(s.capacity(), 5);
+    assert_eq!(s.len(), 9);
+    assert_eq!(s.capacity(), 9);
 }
 
 fn main() {

tests/run-pass/vecs.rs

@@ -1,13 +1,3 @@
-// FIXME: The normal `vec!` macro is currently broken in Miri because it hits the
-// std::vec::SetLenOnDrop code and Miri doesn't call destructors yet.
-macro_rules! miri_vec {
-    ($($e:expr),*) => ({
-        let mut v = Vec::new();
-        $(v.push($e);)*
-        v
-    });
-}
-
 fn make_vec() -> Vec<u8> {
     let mut v = Vec::with_capacity(4);
     v.push(1);
@@ -16,22 +6,22 @@ fn make_vec() -> Vec<u8> {
 }
 
 fn make_vec_macro() -> Vec<u8> {
-    miri_vec![1, 2]
+    vec![1, 2]
 }
 
 fn make_vec_macro_repeat() -> Vec<u8> {
-    miri_vec![42, 42, 42, 42, 42]
+    vec![42; 5]
 }
 
 fn vec_into_iter() -> u8 {
-    miri_vec![1, 2, 3, 4]
+    vec![1, 2, 3, 4]
         .into_iter()
         .map(|x| x * x)
         .fold(0, |x, y| x + y)
 }
 
 fn vec_reallocate() -> Vec<u8> {
-    let mut v = miri_vec![1, 2];
+    let mut v = vec![1, 2];
     v.push(3);
     v.push(4);
     v.push(5);