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Some new tests I added.

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Felix S. Klock II 2018-10-12 01:33:08 +02:00
parent 5b748434af
commit 233fdb4b14
16 changed files with 1308 additions and 0 deletions
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39
src/test/ui/borrowck/issue-54499-field-mutation-marks-mut-as-used.ast.stderr Normal file
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error[E0381]: use of possibly uninitialized variable: `t.0`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:25:31
|
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ use of possibly uninitialized `t.0`
error[E0381]: use of possibly uninitialized variable: `t.1`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:25:36
|
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ use of possibly uninitialized `t.1`
error[E0381]: use of possibly uninitialized variable: `u.0`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:35:31
|
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ use of possibly uninitialized `u.0`
error[E0381]: use of possibly uninitialized variable: `u.1`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:35:36
|
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ use of possibly uninitialized `u.1`
error[E0381]: use of possibly uninitialized variable: `v.x`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:45:31
|
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ use of possibly uninitialized `v.x`
error[E0381]: use of possibly uninitialized variable: `v.y`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:45:36
|
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ use of possibly uninitialized `v.y`
error: aborting due to 6 previous errors
For more information about this error, try `rustc --explain E0381`.

21
src/test/ui/borrowck/issue-54499-field-mutation-marks-mut-as-used.nll.stderr Normal file
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error[E0381]: assign to part of possibly uninitialized variable: `t`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:22:9
|
LL | t.0 = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `t`
error[E0381]: assign to part of possibly uninitialized variable: `u`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:32:9
|
LL | u.0 = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `u`
error[E0381]: assign to part of possibly uninitialized variable: `v`
--> $DIR/issue-54499-field-mutation-marks-mut-as-used.rs:42:9
|
LL | v.x = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `v`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0381`.

49
src/test/ui/borrowck/issue-54499-field-mutation-marks-mut-as-used.rs Normal file
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// revisions: ast nll
// Since we are testing nll migration explicitly as a separate
// revision, don't worry about the --compare-mode=nll on this test.
// ignore-compare-mode-nll
//[ast]compile-flags: -Z borrowck=ast
//[nll]compile-flags: -Z borrowck=migrate -Z two-phase-borrows
#![warn(unused)]
#[derive(Debug)]
struct S(i32);
type Tuple = (S, i32);
struct Tpair(S, i32);
struct Spair { x: S, y: i32 }
fn main() {
{
let mut t: Tuple;
t.0 = S(1);
//[nll]~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
t.1 = 2;
println!("{:?} {:?}", t.0, t.1);
//[ast]~^ ERROR use of possibly uninitialized variable: `t.0` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `t.1` [E0381]
}
{
let mut u: Tpair;
u.0 = S(1);
//[nll]~^ ERROR assign to part of possibly uninitialized variable: `u` [E0381]
u.1 = 2;
println!("{:?} {:?}", u.0, u.1);
//[ast]~^ ERROR use of possibly uninitialized variable: `u.0` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `u.1` [E0381]
}
{
let mut v: Spair;
v.x = S(1);
//[nll]~^ ERROR assign to part of possibly uninitialized variable: `v` [E0381]
v.y = 2;
println!("{:?} {:?}", v.x, v.y);
//[ast]~^ ERROR use of possibly uninitialized variable: `v.x` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `v.y` [E0381]
}
}

69
src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out-with-mut.ast.stderr Normal file
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error[E0382]: use of moved value: `t.0`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:25:31
|
LL | drop(t);
| - value moved here
...
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ value used here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `t.1`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:25:36
|
LL | drop(t);
| - value moved here
...
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ value used here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `u.0`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:33:31
|
LL | drop(u);
| - value moved here
...
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ value used here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `u.1`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:33:36
|
LL | drop(u);
| - value moved here
...
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ value used here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `v.x`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:41:31
|
LL | drop(v);
| - value moved here
...
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ value used here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `v.y`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:41:36
|
LL | drop(v);
| - value moved here
...
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ value used here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error: aborting due to 6 previous errors
For more information about this error, try `rustc --explain E0382`.

33
src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out-with-mut.nll.stderr Normal file
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error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:23:9
|
LL | drop(t);
| - value moved here
LL | t.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `u`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:31:9
|
LL | drop(u);
| - value moved here
LL | u.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `v`
--> $DIR/issue-54499-field-mutation-of-moved-out-with-mut.rs:39:9
|
LL | drop(v);
| - value moved here
LL | v.x = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0382`.

43
src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out-with-mut.rs Normal file
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@ -0,0 +1,43 @@
// revisions: ast nll
// Since we are testing nll migration explicitly as a separate
// revision, don't worry about the --compare-mode=nll on this test.
// ignore-compare-mode-nll
//[ast]compile-flags: -Z borrowck=ast
//[nll]compile-flags: -Z borrowck=migrate -Z two-phase-borrows
#![warn(unused)]
#[derive(Debug)]
struct S(i32);
type Tuple = (S, i32);
struct Tpair(S, i32);
struct Spair { x: S, y: i32 }
fn main() {
{
let mut t: Tuple = (S(0), 0);
drop(t);
t.0 = S(1);
t.1 = 2;
println!("{:?} {:?}", t.0, t.1);
}
{
let mut u: Tpair = Tpair(S(0), 0);
drop(u);
u.0 = S(1);
u.1 = 2;
println!("{:?} {:?}", u.0, u.1);
}
{
let mut v: Spair = Spair { x: S(0), y: 0 };
drop(v);
v.x = S(1);
v.y = 2;
println!("{:?} {:?}", v.x, v.y);
}
}

124
src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out.ast.stderr Normal file
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error[E0594]: cannot assign to field `t.0` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:23:9
|
LL | let t: Tuple = (S(0), 0);
| - help: make this binding mutable: `mut t`
LL | drop(t);
LL | t.0 = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `t.1` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:27:9
|
LL | let t: Tuple = (S(0), 0);
| - help: make this binding mutable: `mut t`
...
LL | t.1 = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `u.0` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:38:9
|
LL | let u: Tpair = Tpair(S(0), 0);
| - help: make this binding mutable: `mut u`
LL | drop(u);
LL | u.0 = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `u.1` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:42:9
|
LL | let u: Tpair = Tpair(S(0), 0);
| - help: make this binding mutable: `mut u`
...
LL | u.1 = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `v.x` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:53:9
|
LL | let v: Spair = Spair { x: S(0), y: 0 };
| - help: make this binding mutable: `mut v`
LL | drop(v);
LL | v.x = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `v.y` of immutable binding
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:57:9
|
LL | let v: Spair = Spair { x: S(0), y: 0 };
| - help: make this binding mutable: `mut v`
...
LL | v.y = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0382]: use of moved value: `t.0`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:30:31
|
LL | drop(t);
| - value moved here
...
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ value used here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `t.1`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:30:36
|
LL | drop(t);
| - value moved here
...
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ value used here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `u.0`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:45:31
|
LL | drop(u);
| - value moved here
...
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ value used here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `u.1`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:45:36
|
LL | drop(u);
| - value moved here
...
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ value used here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `v.x`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:60:31
|
LL | drop(v);
| - value moved here
...
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ value used here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error[E0382]: use of moved value: `v.y`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:60:36
|
LL | drop(v);
| - value moved here
...
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ value used here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error: aborting due to 12 previous errors
Some errors occurred: E0382, E0594.
For more information about an error, try `rustc --explain E0382`.

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src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out.nll.stderr Normal file
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error[E0594]: cannot assign to `t.0`, as `t` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:23:9
|
LL | let t: Tuple = (S(0), 0);
| - help: consider changing this to be mutable: `mut t`
LL | drop(t);
LL | t.0 = S(1);
| ^^^^^^^^^^ cannot assign
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:23:9
|
LL | drop(t);
| - value moved here
LL | t.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `t` has type `(S, i32)`, which does not implement the `Copy` trait
error[E0594]: cannot assign to `t.1`, as `t` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:27:9
|
LL | let t: Tuple = (S(0), 0);
| - help: consider changing this to be mutable: `mut t`
...
LL | t.1 = 2;
| ^^^^^^^ cannot assign
error[E0594]: cannot assign to `u.0`, as `u` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:38:9
|
LL | let u: Tpair = Tpair(S(0), 0);
| - help: consider changing this to be mutable: `mut u`
LL | drop(u);
LL | u.0 = S(1);
| ^^^^^^^^^^ cannot assign
error[E0382]: assign to part of moved value: `u`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:38:9
|
LL | drop(u);
| - value moved here
LL | u.0 = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `u` has type `Tpair`, which does not implement the `Copy` trait
error[E0594]: cannot assign to `u.1`, as `u` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:42:9
|
LL | let u: Tpair = Tpair(S(0), 0);
| - help: consider changing this to be mutable: `mut u`
...
LL | u.1 = 2;
| ^^^^^^^ cannot assign
error[E0594]: cannot assign to `v.x`, as `v` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:53:9
|
LL | let v: Spair = Spair { x: S(0), y: 0 };
| - help: consider changing this to be mutable: `mut v`
LL | drop(v);
LL | v.x = S(1);
| ^^^^^^^^^^ cannot assign
error[E0382]: assign to part of moved value: `v`
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:53:9
|
LL | drop(v);
| - value moved here
LL | v.x = S(1);
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `v` has type `Spair`, which does not implement the `Copy` trait
error[E0594]: cannot assign to `v.y`, as `v` is not declared as mutable
--> $DIR/issue-54499-field-mutation-of-moved-out.rs:57:9
|
LL | let v: Spair = Spair { x: S(0), y: 0 };
| - help: consider changing this to be mutable: `mut v`
...
LL | v.y = 2;
| ^^^^^^^ cannot assign
error: aborting due to 9 previous errors
Some errors occurred: E0382, E0594.
For more information about an error, try `rustc --explain E0382`.

64
src/test/ui/borrowck/issue-54499-field-mutation-of-moved-out.rs Normal file
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@ -0,0 +1,64 @@
// revisions: ast nll
// Since we are testing nll migration explicitly as a separate
// revision, don't worry about the --compare-mode=nll on this test.
// ignore-compare-mode-nll
//[ast]compile-flags: -Z borrowck=ast
//[nll]compile-flags: -Z borrowck=migrate -Z two-phase-borrows
#![warn(unused)]
#[derive(Debug)]
struct S(i32);
type Tuple = (S, i32);
struct Tpair(S, i32);
struct Spair { x: S, y: i32 }
fn main() {
{
let t: Tuple = (S(0), 0);
drop(t);
t.0 = S(1);
//[ast]~^ ERROR cannot assign to field `t.0` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of moved value: `t` [E0382]
//[nll]~| ERROR cannot assign to `t.0`, as `t` is not declared as mutable [E0594]
t.1 = 2;
//[ast]~^ ERROR cannot assign to field `t.1` of immutable binding [E0594]
//[nll]~^^ ERROR cannot assign to `t.1`, as `t` is not declared as mutable [E0594]
println!("{:?} {:?}", t.0, t.1);
//[ast]~^ ERROR use of moved value: `t.0` [E0382]
//[ast]~| ERROR use of moved value: `t.1` [E0382]
}
{
let u: Tpair = Tpair(S(0), 0);
drop(u);
u.0 = S(1);
//[ast]~^ ERROR cannot assign to field `u.0` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of moved value: `u` [E0382]
//[nll]~| ERROR cannot assign to `u.0`, as `u` is not declared as mutable [E0594]
u.1 = 2;
//[ast]~^ ERROR cannot assign to field `u.1` of immutable binding [E0594]
//[nll]~^^ ERROR cannot assign to `u.1`, as `u` is not declared as mutable [E0594]
println!("{:?} {:?}", u.0, u.1);
//[ast]~^ ERROR use of moved value: `u.0` [E0382]
//[ast]~| ERROR use of moved value: `u.1` [E0382]
}
{
let v: Spair = Spair { x: S(0), y: 0 };
drop(v);
v.x = S(1);
//[ast]~^ ERROR cannot assign to field `v.x` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of moved value: `v` [E0382]
//[nll]~| ERROR cannot assign to `v.x`, as `v` is not declared as mutable [E0594]
v.y = 2;
//[ast]~^ ERROR cannot assign to field `v.y` of immutable binding [E0594]
//[nll]~^^ ERROR cannot assign to `v.y`, as `v` is not declared as mutable [E0594]
println!("{:?} {:?}", v.x, v.y);
//[ast]~^ ERROR use of moved value: `v.x` [E0382]
//[ast]~| ERROR use of moved value: `v.y` [E0382]
}
}

91
src/test/ui/borrowck/issue-54499-field-mutation-of-never-init.ast.stderr Normal file
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@ -0,0 +1,91 @@
error[E0594]: cannot assign to field `t.0` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:22:9
|
LL | let t: Tuple;
| - help: make this binding mutable: `mut t`
LL | t.0 = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `t.1` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:25:9
|
LL | let t: Tuple;
| - help: make this binding mutable: `mut t`
...
LL | t.1 = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `u.0` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:34:9
|
LL | let u: Tpair;
| - help: make this binding mutable: `mut u`
LL | u.0 = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `u.1` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:37:9
|
LL | let u: Tpair;
| - help: make this binding mutable: `mut u`
...
LL | u.1 = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `v.x` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:46:9
|
LL | let v: Spair;
| - help: make this binding mutable: `mut v`
LL | v.x = S(1);
| ^^^^^^^^^^ cannot mutably borrow field of immutable binding
error[E0594]: cannot assign to field `v.y` of immutable binding
--> $DIR/issue-54499-field-mutation-of-never-init.rs:49:9
|
LL | let v: Spair;
| - help: make this binding mutable: `mut v`
...
LL | v.y = 2;
| ^^^^^^^ cannot mutably borrow field of immutable binding
error[E0381]: use of possibly uninitialized variable: `t.0`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:27:31
|
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ use of possibly uninitialized `t.0`
error[E0381]: use of possibly uninitialized variable: `t.1`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:27:36
|
LL | println!("{:?} {:?}", t.0, t.1);
| ^^^ use of possibly uninitialized `t.1`
error[E0381]: use of possibly uninitialized variable: `u.0`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:39:31
|
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ use of possibly uninitialized `u.0`
error[E0381]: use of possibly uninitialized variable: `u.1`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:39:36
|
LL | println!("{:?} {:?}", u.0, u.1);
| ^^^ use of possibly uninitialized `u.1`
error[E0381]: use of possibly uninitialized variable: `v.x`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:51:31
|
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ use of possibly uninitialized `v.x`
error[E0381]: use of possibly uninitialized variable: `v.y`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:51:36
|
LL | println!("{:?} {:?}", v.x, v.y);
| ^^^ use of possibly uninitialized `v.y`
error: aborting due to 12 previous errors
Some errors occurred: E0381, E0594.
For more information about an error, try `rustc --explain E0381`.

21
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@ -0,0 +1,21 @@
error[E0381]: assign to part of possibly uninitialized variable: `t`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:22:9
|
LL | t.0 = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `t`
error[E0381]: assign to part of possibly uninitialized variable: `u`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:34:9
|
LL | u.0 = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `u`
error[E0381]: assign to part of possibly uninitialized variable: `v`
--> $DIR/issue-54499-field-mutation-of-never-init.rs:46:9
|
LL | v.x = S(1);
| ^^^^^^^^^^ use of possibly uninitialized `v`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0381`.

55
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@ -0,0 +1,55 @@
// revisions: ast nll
// Since we are testing nll migration explicitly as a separate
// revision, don't worry about the --compare-mode=nll on this test.
// ignore-compare-mode-nll
//[ast]compile-flags: -Z borrowck=ast
//[nll]compile-flags: -Z borrowck=migrate -Z two-phase-borrows
#![warn(unused)]
#[derive(Debug)]
struct S(i32);
type Tuple = (S, i32);
struct Tpair(S, i32);
struct Spair { x: S, y: i32 }
fn main() {
{
let t: Tuple;
t.0 = S(1);
//[ast]~^ ERROR cannot assign to field `t.0` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
t.1 = 2;
//[ast]~^ ERROR cannot assign to field `t.1` of immutable binding [E0594]
println!("{:?} {:?}", t.0, t.1);
//[ast]~^ ERROR use of possibly uninitialized variable: `t.0` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `t.1` [E0381]
}
{
let u: Tpair;
u.0 = S(1);
//[ast]~^ ERROR cannot assign to field `u.0` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of possibly uninitialized variable: `u` [E0381]
u.1 = 2;
//[ast]~^ ERROR cannot assign to field `u.1` of immutable binding [E0594]
println!("{:?} {:?}", u.0, u.1);
//[ast]~^ ERROR use of possibly uninitialized variable: `u.0` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `u.1` [E0381]
}
{
let v: Spair;
v.x = S(1);
//[ast]~^ ERROR cannot assign to field `v.x` of immutable binding [E0594]
//[nll]~^^ ERROR assign to part of possibly uninitialized variable: `v` [E0381]
v.y = 2;
//[ast]~^ ERROR cannot assign to field `v.y` of immutable binding [E0594]
println!("{:?} {:?}", v.x, v.y);
//[ast]~^ ERROR use of possibly uninitialized variable: `v.x` [E0381]
//[ast]~| ERROR use of possibly uninitialized variable: `v.y` [E0381]
}
}

66
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// This test enumerates various cases of interest where a ADT or tuple is
// partially initialized and then used in some way that is wrong *even*
// after rust-lang/rust#54987 is implemented.
//
// See rust-lang/rust#21232, rust-lang/rust#54986, and rust-lang/rust#54987.
//
// See issue-21232-partial-init-and-use.rs for cases of tests that are
// meant to compile and run successfully once rust-lang/rust#54987 is
// implemented.
#![feature(nll)]
struct D {
x: u32,
s: S,
}
struct S {
y: u32,
z: u32,
}
impl Drop for D {
fn drop(&mut self) { }
}
fn cannot_partially_init_adt_with_drop() {
let d: D;
d.x = 10;
//~^ ERROR assign of possibly uninitialized variable: `d` [E0381]
}
fn cannot_partially_init_mutable_adt_with_drop() {
let mut d: D;
d.x = 10;
//~^ ERROR assign of possibly uninitialized variable: `d` [E0381]
}
fn cannot_partially_reinit_adt_with_drop() {
let mut d = D { x: 0, s: S{ y: 0, z: 0 } };
drop(d);
d.x = 10;
//~^ ERROR assign of moved value: `d` [E0382]
}
fn cannot_partially_init_inner_adt_via_outer_with_drop() {
let d: D;
d.s.y = 20;
//~^ ERROR assign to part of possibly uninitialized variable: `d` [E0381]
}
fn cannot_partially_init_inner_adt_via_mutable_outer_with_drop() {
let mut d: D;
d.s.y = 20;
//~^ ERROR assign to part of possibly uninitialized variable: `d` [E0381]
}
fn cannot_partially_reinit_inner_adt_via_outer_with_drop() {
let mut d = D { x: 0, s: S{ y: 0, z: 0} };
drop(d);
d.s.y = 20;
//~^ ERROR assign to part of moved value: `d` [E0382]
}
fn main() { }

48
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@ -0,0 +1,48 @@
error[E0381]: assign of possibly uninitialized variable: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:30:5
|
LL | d.x = 10;
| ^^^^^^^^ use of possibly uninitialized `d`
error[E0381]: assign of possibly uninitialized variable: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:36:5
|
LL | d.x = 10;
| ^^^^^^^^ use of possibly uninitialized `d`
error[E0382]: assign of moved value: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:43:5
|
LL | drop(d);
| - value moved here
LL | d.x = 10;
| ^^^^^^^^ value assigned here after move
|
= note: move occurs because `d` has type `D`, which does not implement the `Copy` trait
error[E0381]: assign to part of possibly uninitialized variable: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:49:5
|
LL | d.s.y = 20;
| ^^^^^^^^^^ use of possibly uninitialized `d.s`
error[E0381]: assign to part of possibly uninitialized variable: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:55:5
|
LL | d.s.y = 20;
| ^^^^^^^^^^ use of possibly uninitialized `d.s`
error[E0382]: assign to part of moved value: `d`
--> $DIR/issue-21232-partial-init-and-erroneous-use.rs:62:5
|
LL | drop(d);
| - value moved here
LL | d.s.y = 20;
| ^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `d` has type `D`, which does not implement the `Copy` trait
error: aborting due to 6 previous errors
Some errors occurred: E0381, E0382.
For more information about an error, try `rustc --explain E0381`.

311
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// This test enumerates various cases of interest for partial
// [re]initialization of ADTs and tuples.
//
// See rust-lang/rust#21232, rust-lang/rust#54986, and rust-lang/rust#54987.
//
// All of tests in this file are expected to change from being
// rejected, at least under NLL (by rust-lang/rust#54986) to being
// **accepted** when rust-lang/rust#54987 is implemented.
// (That's why there are assertions in the code.)
//
// See issue-21232-partial-init-and-erroneous-use.rs for cases of
// tests that are meant to continue failing to compile once
// rust-lang/rust#54987 is implemented.
#![feature(nll)]
struct S<Y> {
x: u32,
// Note that even though `y` may implement `Drop`, under #54987 we
// will still allow partial initialization of `S` itself.
y: Y,
}
enum Void { }
type B = Box<u32>;
impl S<B> { fn new() -> Self { S { x: 0, y: Box::new(0) } } }
fn borrow_s(s: &S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
fn move_s(s: S<B>) { assert_eq!(s.x, 10); assert_eq!(*s.y, 20); }
fn borrow_field(x: &u32) { assert_eq!(*x, 10); }
type T = (u32, B);
type Tvoid = (u32, Void);
fn borrow_t(t: &T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
fn move_t(t: T) { assert_eq!(t.0, 10); assert_eq!(*t.1, 20); }
struct Q<F> {
v: u32,
r: R<F>,
}
struct R<F> {
w: u32,
f: F,
}
impl<F> Q<F> { fn new(f: F) -> Self { Q { v: 0, r: R::new(f) } } }
impl<F> R<F> { fn new(f: F) -> Self { R { w: 0, f } } }
// Axes to cover:
// * local/field: Is the structure in a local or a field
// * fully/partial/void: Are we fully initializing it before using any part?
// Is whole type empty due to a void component?
// * init/reinit: First initialization, or did we previously inititalize and then move out?
// * struct/tuple: Is this a struct or a (X, Y).
//
// As a shorthand for the cases above, adding a numeric summary to
// each test's fn name to denote each point on each axis.
//
// E.g. 1000 = field fully init struct; 0211 = local void reinit tuple
// It got pretty monotonous writing the same code over and over, and I
// feared I would forget details. So I abstracted some desiderata into
// macros. But I left the initialization code inline, because that's
// where the errors for #54986 will be emited.
macro_rules! use_fully {
(struct $s:expr) => { {
borrow_field(& $s.x );
borrow_s(& $s );
move_s( $s );
} };
(tuple $t:expr) => { {
borrow_field(& $t.0 );
borrow_t(& $t );
move_t( $t );
} }
}
macro_rules! use_part {
(struct $s:expr) => { {
borrow_field(& $s.x );
match $s { S { ref x, y: _ } => { borrow_field(x); } }
} };
(tuple $t:expr) => { {
borrow_field(& $t.0 );
match $t { (ref x, _) => { borrow_field(x); } }
} }
}
fn test_0000_local_fully_init_and_use_struct() {
let s: S<B>;
s.x = 10; s.y = Box::new(20);
//~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
use_fully!(struct s);
}
fn test_0001_local_fully_init_and_use_tuple() {
let t: T;
t.0 = 10; t.1 = Box::new(20);
//~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
use_fully!(tuple t);
}
fn test_0010_local_fully_reinit_and_use_struct() {
let mut s: S<B> = S::new(); drop(s);
s.x = 10; s.y = Box::new(20);
//~^ ERROR assign to part of moved value: `s` [E0382]
use_fully!(struct s);
}
fn test_0011_local_fully_reinit_and_use_tuple() {
let mut t: T = (0, Box::new(0)); drop(t);
t.0 = 10; t.1 = Box::new(20);
//~^ ERROR assign to part of moved value: `t` [E0382]
use_fully!(tuple t);
}
fn test_0100_local_partial_init_and_use_struct() {
let s: S<B>;
s.x = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
use_part!(struct s);
}
fn test_0101_local_partial_init_and_use_tuple() {
let t: T;
t.0 = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
use_part!(tuple t);
}
fn test_0110_local_partial_reinit_and_use_struct() {
let mut s: S<B> = S::new(); drop(s);
s.x = 10;
//~^ ERROR assign to part of moved value: `s` [E0382]
use_part!(struct s);
}
fn test_0111_local_partial_reinit_and_use_tuple() {
let mut t: T = (0, Box::new(0)); drop(t);
t.0 = 10;
//~^ ERROR assign to part of moved value: `t` [E0382]
use_part!(tuple t);
}
fn test_0200_local_void_init_and_use_struct() {
let s: S<Void>;
s.x = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `s` [E0381]
use_part!(struct s);
}
fn test_0201_local_void_init_and_use_tuple() {
let t: Tvoid;
t.0 = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `t` [E0381]
use_part!(tuple t);
}
// NOTE: uniform structure of tests here makes n21n (aka combining
// Void with Reinit) an (even more) senseless case, as we cannot
// safely create initial instance containing Void to move out of and
// then reinitialize. While I was tempted to sidestep this via some
// unsafe code (eek), lets just instead not encode such tests.
// fn test_0210_local_void_reinit_and_use_struct() { unimplemented!() }
// fn test_0211_local_void_reinit_and_use_tuple() { unimplemented!() }
fn test_1000_field_fully_init_and_use_struct() {
let q: Q<S<B>>;
q.r.f.x = 10; q.r.f.y = Box::new(20);
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_fully!(struct q.r.f);
}
fn test_1001_field_fully_init_and_use_tuple() {
let q: Q<T>;
q.r.f.0 = 10; q.r.f.1 = Box::new(20);
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_fully!(tuple q.r.f);
}
fn test_1010_field_fully_reinit_and_use_struct() {
let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
q.r.f.x = 10; q.r.f.y = Box::new(20);
//~^ ERROR assign to part of moved value: `q.r` [E0382]
use_fully!(struct q.r.f);
}
fn test_1011_field_fully_reinit_and_use_tuple() {
let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
q.r.f.0 = 10; q.r.f.1 = Box::new(20);
//~^ ERROR assign to part of moved value: `q.r` [E0382]
use_fully!(tuple q.r.f);
}
fn test_1100_field_partial_init_and_use_struct() {
let q: Q<S<B>>;
q.r.f.x = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_part!(struct q.r.f);
}
fn test_1101_field_partial_init_and_use_tuple() {
let q: Q<T>;
q.r.f.0 = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_part!(tuple q.r.f);
}
fn test_1110_field_partial_reinit_and_use_struct() {
let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
q.r.f.x = 10;
//~^ ERROR assign to part of moved value: `q.r` [E0382]
use_part!(struct q.r.f);
}
fn test_1111_field_partial_reinit_and_use_tuple() {
let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
q.r.f.0 = 10;
//~^ ERROR assign to part of moved value: `q.r` [E0382]
use_part!(tuple q.r.f);
}
fn test_1200_field_void_init_and_use_struct() {
let mut q: Q<S<Void>>;
q.r.f.x = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_part!(struct q.r.f);
}
fn test_1201_field_void_init_and_use_tuple() {
let mut q: Q<Tvoid>;
q.r.f.0 = 10;
//~^ ERROR assign to part of possibly uninitialized variable: `q` [E0381]
use_part!(tuple q.r.f);
}
// See NOTE abve.
// fn test_1210_field_void_reinit_and_use_struct() { unimplemented!() }
// fn test_1211_field_void_reinit_and_use_tuple() { unimplemented!() }
// The below are some additional cases of interest that have been
// transcribed from other bugs based on old erroneous codegen when we
// encountered partial writes.
fn issue_26996() {
let mut c = (1, "".to_owned());
match c {
c2 => {
c.0 = 2; //~ ERROR assign to part of moved value
assert_eq!(c2.0, 1);
}
}
}
fn issue_27021() {
let mut c = (1, (1, "".to_owned()));
match c {
c2 => {
(c.1).0 = 2; //~ ERROR assign to part of moved value
assert_eq!((c2.1).0, 1);
}
}
let mut c = (1, (1, (1, "".to_owned())));
match c.1 {
c2 => {
((c.1).1).0 = 3; //~ ERROR assign to part of moved value
assert_eq!((c2.1).0, 1);
}
}
}
fn main() {
test_0000_local_fully_init_and_use_struct();
test_0001_local_fully_init_and_use_tuple();
test_0010_local_fully_reinit_and_use_struct();
test_0011_local_fully_reinit_and_use_tuple();
test_0100_local_partial_init_and_use_struct();
test_0101_local_partial_init_and_use_tuple();
test_0110_local_partial_reinit_and_use_struct();
test_0111_local_partial_reinit_and_use_tuple();
test_0200_local_void_init_and_use_struct();
test_0201_local_void_init_and_use_tuple();
// test_0210_local_void_reinit_and_use_struct();
// test_0211_local_void_reinit_and_use_tuple();
test_1000_field_fully_init_and_use_struct();
test_1001_field_fully_init_and_use_tuple();
test_1010_field_fully_reinit_and_use_struct();
test_1011_field_fully_reinit_and_use_tuple();
test_1100_field_partial_init_and_use_struct();
test_1101_field_partial_init_and_use_tuple();
test_1110_field_partial_reinit_and_use_struct();
test_1111_field_partial_reinit_and_use_tuple();
test_1200_field_void_init_and_use_struct();
test_1201_field_void_init_and_use_tuple();
// test_1210_field_void_reinit_and_use_struct();
// test_1211_field_void_reinit_and_use_tuple();
issue_26996();
issue_27021();
}

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@ -0,0 +1,186 @@
error[E0381]: assign to part of possibly uninitialized variable: `s`
--> $DIR/issue-21232-partial-init-and-use.rs:99:5
|
LL | s.x = 10; s.y = Box::new(20);
| ^^^^^^^^ use of possibly uninitialized `s`
error[E0381]: assign to part of possibly uninitialized variable: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:106:5
|
LL | t.0 = 10; t.1 = Box::new(20);
| ^^^^^^^^ use of possibly uninitialized `t`
error[E0382]: assign to part of moved value: `s`
--> $DIR/issue-21232-partial-init-and-use.rs:113:5
|
LL | let mut s: S<B> = S::new(); drop(s);
| - value moved here
LL | s.x = 10; s.y = Box::new(20);
| ^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `s` has type `S<std::boxed::Box<u32>>`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:120:5
|
LL | let mut t: T = (0, Box::new(0)); drop(t);
| - value moved here
LL | t.0 = 10; t.1 = Box::new(20);
| ^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `t` has type `(u32, std::boxed::Box<u32>)`, which does not implement the `Copy` trait
error[E0381]: assign to part of possibly uninitialized variable: `s`
--> $DIR/issue-21232-partial-init-and-use.rs:127:5
|
LL | s.x = 10;
| ^^^^^^^^ use of possibly uninitialized `s`
error[E0381]: assign to part of possibly uninitialized variable: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:134:5
|
LL | t.0 = 10;
| ^^^^^^^^ use of possibly uninitialized `t`
error[E0382]: assign to part of moved value: `s`
--> $DIR/issue-21232-partial-init-and-use.rs:141:5
|
LL | let mut s: S<B> = S::new(); drop(s);
| - value moved here
LL | s.x = 10;
| ^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `s` has type `S<std::boxed::Box<u32>>`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:148:5
|
LL | let mut t: T = (0, Box::new(0)); drop(t);
| - value moved here
LL | t.0 = 10;
| ^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `t` has type `(u32, std::boxed::Box<u32>)`, which does not implement the `Copy` trait
error[E0381]: assign to part of possibly uninitialized variable: `s`
--> $DIR/issue-21232-partial-init-and-use.rs:155:5
|
LL | s.x = 10;
| ^^^^^^^^ use of possibly uninitialized `s`
error[E0381]: assign to part of possibly uninitialized variable: `t`
--> $DIR/issue-21232-partial-init-and-use.rs:162:5
|
LL | t.0 = 10;
| ^^^^^^^^ use of possibly uninitialized `t`
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:178:5
|
LL | q.r.f.x = 10; q.r.f.y = Box::new(20);
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:185:5
|
LL | q.r.f.0 = 10; q.r.f.1 = Box::new(20);
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0382]: assign to part of moved value: `q.r`
--> $DIR/issue-21232-partial-init-and-use.rs:192:5
|
LL | let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
| --- value moved here
LL | q.r.f.x = 10; q.r.f.y = Box::new(20);
| ^^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `q.r` has type `R<S<std::boxed::Box<u32>>>`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `q.r`
--> $DIR/issue-21232-partial-init-and-use.rs:199:5
|
LL | let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
| --- value moved here
LL | q.r.f.0 = 10; q.r.f.1 = Box::new(20);
| ^^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `q.r` has type `R<(u32, std::boxed::Box<u32>)>`, which does not implement the `Copy` trait
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:206:5
|
LL | q.r.f.x = 10;
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:213:5
|
LL | q.r.f.0 = 10;
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0382]: assign to part of moved value: `q.r`
--> $DIR/issue-21232-partial-init-and-use.rs:220:5
|
LL | let mut q: Q<S<B>> = Q::new(S::new()); drop(q.r);
| --- value moved here
LL | q.r.f.x = 10;
| ^^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `q.r` has type `R<S<std::boxed::Box<u32>>>`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `q.r`
--> $DIR/issue-21232-partial-init-and-use.rs:227:5
|
LL | let mut q: Q<T> = Q::new((0, Box::new(0))); drop(q.r);
| --- value moved here
LL | q.r.f.0 = 10;
| ^^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `q.r` has type `R<(u32, std::boxed::Box<u32>)>`, which does not implement the `Copy` trait
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:234:5
|
LL | q.r.f.x = 10;
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0381]: assign to part of possibly uninitialized variable: `q`
--> $DIR/issue-21232-partial-init-and-use.rs:241:5
|
LL | q.r.f.0 = 10;
| ^^^^^^^^^^^^ use of possibly uninitialized `q.r.f`
error[E0382]: assign to part of moved value: `c`
--> $DIR/issue-21232-partial-init-and-use.rs:259:13
|
LL | c2 => {
| -- value moved here
LL | c.0 = 2; //~ ERROR assign to part of moved value
| ^^^^^^^ value partially assigned here after move
|
= note: move occurs because `c` has type `(i32, std::string::String)`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `c`
--> $DIR/issue-21232-partial-init-and-use.rs:269:13
|
LL | c2 => {
| -- value moved here
LL | (c.1).0 = 2; //~ ERROR assign to part of moved value
| ^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `c` has type `(i32, (i32, std::string::String))`, which does not implement the `Copy` trait
error[E0382]: assign to part of moved value: `c.1`
--> $DIR/issue-21232-partial-init-and-use.rs:277:13
|
LL | c2 => {
| -- value moved here
LL | ((c.1).1).0 = 3; //~ ERROR assign to part of moved value
| ^^^^^^^^^^^^^^^ value partially assigned here after move
|
= note: move occurs because `c.1` has type `(i32, (i32, std::string::String))`, which does not implement the `Copy` trait
error: aborting due to 23 previous errors
Some errors occurred: E0381, E0382.
For more information about an error, try `rustc --explain E0381`.