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|
// edition:2021
// Test that move closures drop derefs with `capture_disjoint_fields` enabled.
#![feature(rustc_attrs)]
fn simple_move_closure() {
struct S(String);
struct T(S);
let t = T(S("s".into()));
let mut c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
t.0.0 = "new S".into();
//~^ NOTE: Capturing t[(0, 0),(0, 0)] -> MutBorrow
//~| NOTE: Min Capture t[(0, 0),(0, 0)] -> ByValue
};
c();
}
// Test move closure use reborrows when using references
fn simple_ref() {
let mut s = 10;
let ref_s = &mut s;
let mut c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
*ref_s += 10;
//~^ NOTE: Capturing ref_s[Deref] -> MutBorrow
//~| NOTE: Min Capture ref_s[] -> ByValue
};
c();
}
// Test move closure use reborrows when using references
fn struct_contains_ref_to_another_struct_1() {
struct S(String);
struct T<'a>(&'a mut S);
let mut s = S("s".into());
let t = T(&mut s);
let mut c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
t.0.0 = "new s".into();
//~^ NOTE: Capturing t[(0, 0),Deref,(0, 0)] -> MutBorrow
//~| NOTE: Min Capture t[(0, 0)] -> ByValue
};
c();
}
// Test that we can use reborrows to read data of Copy types
// i.e. without truncating derefs
fn struct_contains_ref_to_another_struct_2() {
struct S(i32);
struct T<'a>(&'a S);
let s = S(0);
let t = T(&s);
let mut c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
let _t = t.0.0;
//~^ NOTE: Capturing t[(0, 0),Deref,(0, 0)] -> ImmBorrow
//~| NOTE: Min Capture t[(0, 0)] -> ByValue
};
c();
}
// Test that we can use truncate to move out of !Copy types
fn struct_contains_ref_to_another_struct_3() {
struct S(String);
struct T<'a>(&'a S);
let s = S("s".into());
let t = T(&s);
let mut c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
let _t = t.0.0;
//~^ NOTE: Capturing t[(0, 0),Deref,(0, 0)] -> ByValue
//~| NOTE: Min Capture t[(0, 0)] -> ByValue
};
c();
}
// Test that derefs of box are truncated in move closures
fn truncate_box_derefs() {
struct S(i32);
// Content within the box is moved within the closure
let b = Box::new(S(10));
let c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
let _t = b.0;
//~^ NOTE: Capturing b[Deref,(0, 0)] -> ImmBorrow
//~| NOTE: Min Capture b[] -> ByValue
};
c();
// Content within the box is used by a shared ref and the box is the root variable
let b = Box::new(S(10));
let c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
println!("{}", b.0);
//~^ NOTE: Capturing b[Deref,(0, 0)] -> ImmBorrow
//~| NOTE: Min Capture b[] -> ByValue
};
c();
// Content within the box is used by a shared ref and the box is not the root variable
let b = Box::new(S(10));
let t = (0, b);
let c = #[rustc_capture_analysis]
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
move || {
//~^ ERROR: First Pass analysis includes:
//~| ERROR: Min Capture analysis includes:
println!("{}", t.1.0);
//~^ NOTE: Capturing t[(1, 0),Deref,(0, 0)] -> ImmBorrow
//~| NOTE: Min Capture t[(1, 0)] -> ByValue
};
}
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)] -> MutBorrow
//~| Min Capture analysis includes:
//~| NOTE: Min Capture box_p_foo[] -> ByValue
}
// 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)] -> MutBorrow
//~| Min Capture analysis includes:
//~| NOTE: Min Capture p_foo[] -> ByValue
}
// Test that move closures can take ownership of Copy type
fn returned_closure_owns_copy_type_data() -> impl Fn() -> i32 {
let x = 10;
let c = #[rustc_capture_analysis] move || x;
//~^ ERROR: attributes on expressions are experimental
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
//~| First Pass analysis includes:
//~| NOTE: Capturing x[] -> ImmBorrow
//~| Min Capture analysis includes:
//~| NOTE: Min Capture x[] -> ByValue
c
}
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();
}
|
