Add test for Unique<T>, weak ref counts and ref counts for Weak<T>

Author: wesleywiser

src/etc/natvis/liballoc.natvis

@@ -64,12 +64,15 @@
     <Expand>
       <ExpandedItem>ptr.pointer->value</ExpandedItem>
       <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
   <Type Name="alloc::rc::Weak&lt;*&gt;">
     <DisplayString>{ptr.pointer->value}</DisplayString>
     <Expand>
       <ExpandedItem>ptr.pointer->value</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
 
@@ -78,12 +81,15 @@
     <Expand>
       <ExpandedItem>ptr.pointer->data</ExpandedItem>
       <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
   <Type Name="alloc::sync::Weak&lt;*&gt;">
     <DisplayString>{ptr.pointer->data}</DisplayString>
     <Expand>
       <ExpandedItem>ptr.pointer->data</ExpandedItem>
+      <Item Name="[Reference count]">ptr.pointer->strong</Item>
+      <Item Name="[Weak reference count]">ptr.pointer->weak</Item>
     </Expand>
   </Type>
   <Type Name="alloc::borrow::Cow&lt;*&gt;">

src/test/debuginfo/marker-types.rs

@@ -21,9 +21,17 @@
 // cdb-check:    [capacity]       : 0x4 [Type: unsigned __int64]
 // cdb-check:    [chars]          : "this"
 
+// cdb-command: dx unique
+// cdb-check:unique           : Unique(0x[...]: (0x2a, 4321)) [Type: core::ptr::unique::Unique<tuple$<u64,i32> >]
+// cdb-check:    [<Raw View>]     [Type: core::ptr::unique::Unique<tuple$<u64,i32> >]
+// cdb-check:    [0]              : 0x2a [Type: unsigned __int64]
+// cdb-check:    [1]              : 4321 [Type: int]
+
+#![feature(ptr_internals)]
+
 use std::mem::ManuallyDrop;
 use std::pin::Pin;
-use std::ptr::NonNull;
+use std::ptr::{NonNull, Unique};
 
 fn main() {
     let nonnull: NonNull<_> = (&12u32).into();
@@ -33,6 +41,8 @@ fn main() {
     let mut s = "this".to_string();
     let pin = Pin::new(&mut s);
 
+    let unique: Unique<_> = (&mut (42u64, 4321i32)).into();
+
     zzz(); // #break
 }
 

src/test/debuginfo/rc_arc.rs

@@ -31,29 +31,37 @@
 // cdb-check:r,d              : 42 [Type: alloc::rc::Rc<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::rc::Rc<i32>]
 // cdb-check:    [Reference count] : 2 [Type: core::cell::Cell<usize>]
+// cdb-check:    [Weak reference count] : 2 [Type: core::cell::Cell<usize>]
 
 // cdb-command:dx r1,d
 // cdb-check:r1,d             : 42 [Type: alloc::rc::Rc<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::rc::Rc<i32>]
 // cdb-check:    [Reference count] : 2 [Type: core::cell::Cell<usize>]
+// cdb-check:    [Weak reference count] : 2 [Type: core::cell::Cell<usize>]
 
 // cdb-command:dx w1,d
 // cdb-check:w1,d             : 42 [Type: alloc::rc::Weak<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::rc::Weak<i32>]
+// cdb-check:    [Reference count] : 2 [Type: core::cell::Cell<usize>]
+// cdb-check:    [Weak reference count] : 2 [Type: core::cell::Cell<usize>]
 
 // cdb-command:dx a,d
 // cdb-check:a,d              : 42 [Type: alloc::sync::Arc<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::sync::Arc<i32>]
 // cdb-check:    [Reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
+// cdb-check:    [Weak reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
 
 // cdb-command:dx a1,d
 // cdb-check:a1,d             : 42 [Type: alloc::sync::Arc<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::sync::Arc<i32>]
 // cdb-check:    [Reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
+// cdb-check:    [Weak reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
 
 // cdb-command:dx w2,d
 // cdb-check:w2,d             : 42 [Type: alloc::sync::Weak<i32>]
 // cdb-check:    [<Raw View>]     [Type: alloc::sync::Weak<i32>]
+// cdb-check:    [Reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
+// cdb-check:    [Weak reference count] : 2 [Type: core::sync::atomic::AtomicUsize]
 
 use std::rc::Rc;
 use std::sync::Arc;