Windows debugging

Author: RalfJung

.appveyor.yml

@@ -41,7 +41,8 @@ build_script:
 
 test_script:
     # Test miri
-    - cargo test --release --all-features
+    - cargo test --release --all-features heap
+    - false
     # Test cargo integration
     - cd test-cargo-miri
     - '"C:\msys64\mingw64\bin\python3.exe" run-test.py'

tests/run-pass/heap_allocator.rs

@@ -40,7 +40,9 @@ fn check_overalign_requests<T: Alloc>(mut allocator: T) {
             allocator.alloc(Layout::from_size_align(size, align).unwrap()).unwrap()
         }).collect();
         for &ptr in &pointers {
-            assert_eq!((ptr.as_ptr() as usize) % align, 0,
+            let ptr = ptr.as_ptr();
+            eprintln!("{:?}, {}", ptr, (ptr as usize) % 256);
+            assert_eq!((ptr as usize) % align, 0,
                        "Got a pointer less aligned than requested")
         }