Add more tests

Author: arora-aman

src/test/ui/closures/2229_closure_analysis/move_closure.rs

@@ -159,11 +159,49 @@ fn truncate_box_derefs() {
     };
 }
 
+struct Foo { x: i32 }
+
+// Ensure that even in move closures, if the data is not owned by the root variable
+// then we don't truncate the derefs or a ByValue capture, rather do a reborrow
+fn box_mut_1() {
+    let mut foo = Foo { x: 0 } ;
+
+    let p_foo = &mut foo;
+    let box_p_foo = Box::new(p_foo);
+
+    let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+    //~^ ERROR: attributes on expressions are experimental
+    //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| First Pass analysis includes:
+    //~| NOTE: Capturing box_p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+    //~| Min Capture analysis includes:
+    //~| NOTE: Min Capture box_p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+}
+
+// Ensure that even in move closures, if the data is not owned by the root variable
+// then we don't truncate the derefs or a ByValue capture, rather do a reborrow
+fn box_mut_2() {
+    let foo = Foo { x: 0 } ;
+
+    let mut box_foo = Box::new(foo);
+    let p_foo = &mut box_foo;
+
+    let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+    //~^ ERROR: attributes on expressions are experimental
+    //~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
+    //~| First Pass analysis includes:
+    //~| NOTE: Capturing p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+    //~| Min Capture analysis includes:
+    //~| NOTE: Min Capture p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+}
+
 fn main() {
     simple_move_closure();
     simple_ref();
     struct_contains_ref_to_another_struct_1();
     struct_contains_ref_to_another_struct_2();
     struct_contains_ref_to_another_struct_3();
     truncate_box_derefs();
+    box_mut_2();
+    box_mut_1();
 }

src/test/ui/closures/2229_closure_analysis/move_closure.stderr

@@ -70,6 +70,24 @@ LL |     let c = #[rustc_capture_analysis]
    = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
 
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/move_closure.rs:172:13
+   |
+LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/move_closure.rs:189:13
+   |
+LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
 error: First Pass analysis includes:
   --> $DIR/move_closure.rs:15:5
    |
@@ -358,6 +376,54 @@ note: Min Capture t[(1, 0)] -> ByValue
 LL |         println!("{}", t.1.0);
    |                        ^^^^^
 
-error: aborting due to 24 previous errors
+error: First Pass analysis includes:
+  --> $DIR/move_closure.rs:172:39
+   |
+LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+   |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: Capturing box_p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+  --> $DIR/move_closure.rs:172:47
+   |
+LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+   |                                               ^^^^^^^^^^^
+
+error: Min Capture analysis includes:
+  --> $DIR/move_closure.rs:172:39
+   |
+LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+   |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: Min Capture box_p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+  --> $DIR/move_closure.rs:172:47
+   |
+LL |     let c = #[rustc_capture_analysis] move || box_p_foo.x += 10;
+   |                                               ^^^^^^^^^^^
+
+error: First Pass analysis includes:
+  --> $DIR/move_closure.rs:189:39
+   |
+LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+   |                                       ^^^^^^^^^^^^^^^^^^^^^
+   |
+note: Capturing p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+  --> $DIR/move_closure.rs:189:47
+   |
+LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+   |                                               ^^^^^^^
+
+error: Min Capture analysis includes:
+  --> $DIR/move_closure.rs:189:39
+   |
+LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+   |                                       ^^^^^^^^^^^^^^^^^^^^^
+   |
+note: Min Capture p_foo[Deref,Deref,(0, 0)] -> UniqueImmBorrow
+  --> $DIR/move_closure.rs:189:47
+   |
+LL |     let c = #[rustc_capture_analysis] move || p_foo.x += 10;
+   |                                               ^^^^^^^
+
+error: aborting due to 30 previous errors
 
 For more information about this error, try `rustc --explain E0658`.