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--bless bindings-after-at tests

This commit is contained in:
Mazdak Farrokhzad 2019-12-15 00:32:20 +01:00
parent 10ac7ea127
commit 9ab36037a4
7 changed files with 500 additions and 69 deletions
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2
src/librustc_mir/hair/pattern/check_match.rs
View File

@ -695,7 +695,7 @@ fn check_borrow_conflicts_in_at_patterns(cx: &MatchVisitor<'_, '_>, pat: &Pat) {
};
let msg = &format!(
"cannot borrow `{}` as {} because it is also borrowed as {}",
name, primary, also,
name, also, primary,
);
let mut err = sess.struct_span_err(pat.span, msg);
err.span_label(binding_span, &format!("{} borrow occurs here", primary));

12
src/test/ui/pattern/bindings-after-at/borrowck-pat-at-and-box.rs
View File

@ -29,16 +29,20 @@ fn main() {
drop(a);
drop(b);
let ref a @ box ref mut b = Box::new(NC); // FIXME: This should not compile.
let ref a @ box ref mut b = Box::new(NC); // FIXME: This should not compile.
let ref a @ box ref mut b = Box::new(NC);
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
let ref a @ box ref mut b = Box::new(NC);
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
*b = NC;
let ref a @ box ref mut b = Box::new(NC);
//~^ ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
*b = NC;
drop(a);
let ref mut a @ box ref b = Box::new(NC);
//~^ ERROR cannot borrow `_` as immutable because it is also borrowed as mutable
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot borrow `_` as immutable because it is also borrowed as mutable
*a = Box::new(NC);
drop(b);
}

44
src/test/ui/pattern/bindings-after-at/borrowck-pat-at-and-box.stderr
View File

@ -27,6 +27,42 @@ LL | let ref a @ box b = Box::new(NC);
| | by-move pattern here
| by-ref pattern here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-at-and-box.rs:32:9
|
LL | let ref a @ box ref mut b = Box::new(NC);
| -----^^^^^^^---------
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-at-and-box.rs:34:9
|
LL | let ref a @ box ref mut b = Box::new(NC);
| -----^^^^^^^---------
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-at-and-box.rs:37:9
|
LL | let ref a @ box ref mut b = Box::new(NC);
| -----^^^^^^^---------
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-at-and-box.rs:43:9
|
LL | let ref mut a @ box ref b = Box::new(NC);
| ---------^^^^^^^-----
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error[E0382]: use of moved value
--> $DIR/borrowck-pat-at-and-box.rs:11:18
|
@ -46,7 +82,7 @@ LL | let a @ box b = Box::new(C);
| value moved here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-at-and-box.rs:35:21
--> $DIR/borrowck-pat-at-and-box.rs:37:21
|
LL | let ref a @ box ref mut b = Box::new(NC);
| ------------^^^^^^^^^
@ -58,18 +94,18 @@ LL | drop(a);
| - immutable borrow later used here
error[E0502]: cannot borrow `_` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-at-and-box.rs:40:25
--> $DIR/borrowck-pat-at-and-box.rs:43:25
|
LL | let ref mut a @ box ref b = Box::new(NC);
| ----------------^^^^^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
LL |
...
LL | *a = Box::new(NC);
| -- mutable borrow later used here
error: aborting due to 7 previous errors
error: aborting due to 11 previous errors
Some errors have detailed explanations: E0007, E0009, E0382, E0502.
For more information about an error, try `rustc --explain E0007`.

63
src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.rs
View File

@ -9,7 +9,8 @@ enum Option<T> {
fn main() {
match &mut Some(1) {
ref mut z @ &mut Some(ref a) => {
//~^ ERROR cannot borrow `_` as immutable because it is also borrowed as mutable
//~^ ERROR cannot borrow `z` as immutable because it is also borrowed as mutable
//~| ERROR cannot borrow `_` as immutable because it is also borrowed as mutable
**z = None;
println!("{}", *a);
}
@ -18,30 +19,38 @@ fn main() {
struct U;
let ref a @ ref mut b = U; // FIXME: This should not compile.
let ref mut a @ ref b = U; // FIXME: This should not compile.
let ref a @ (ref mut b, ref mut c) = (U, U); // FIXME: This should not compile.
let ref mut a @ (ref b, ref c) = (U, U); // FIXME: This should not compile.
// FIXME: Seems like we have a soundness hole here.
let ref mut a @ ref b = U;
*a = U; // We are mutating...
drop(b); // ..but at the same time we are holding a live shared borrow.
// FIXME: Inverted; seems like the same issue exists here as well.
let ref a @ ref mut b = U;
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
let ref mut a @ ref b = U;
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
let ref a @ (ref mut b, ref mut c) = (U, U);
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
let ref mut a @ (ref b, ref c) = (U, U);
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
let ref mut a @ ref b = U;
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
*a = U;
drop(b);
let ref a @ ref mut b = U;
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
*b = U;
drop(a);
match Ok(U) {
ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
*a = Err(U); // FIXME: ^ should not compile.
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
*a = Err(U);
drop(b);
}
}
match Ok(U) {
ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
//~^ ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
*b = U;
drop(a);
@ -50,38 +59,50 @@ fn main() {
match Ok(U) {
ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
//~^ ERROR cannot assign to `*b`, as it is immutable for the pattern guard
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot assign to `*b`, as it is immutable for the pattern guard
_ => {}
}
match Ok(U) {
ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
//~^ ERROR cannot assign to `*a`, as it is immutable for the pattern guard
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot assign to `*a`, as it is immutable for the pattern guard
_ => {}
}
match Ok(U) {
ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
//~^ ERROR cannot move out of `b` in pattern guard
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot move out of `b` in pattern guard
_ => {}
}
match Ok(U) {
ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
//~^ ERROR cannot move out of `a` in pattern guard
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
//~| ERROR cannot move out of `a` in pattern guard
_ => {}
}
let ref a @ (ref mut b, ref mut c) = (U, U);
*b = U; // FIXME: ^ should not compile.
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
*b = U;
*c = U;
let ref a @ (ref mut b, ref mut c) = (U, U);
//~^ ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
*b = U;
drop(a);
let ref a @ (ref mut b, ref mut c) = (U, U);
*b = U; //~^ ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
//~^ ERROR cannot borrow `a` as mutable because it is also borrowed as immutable
*b = U; //~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
*c = U; //~| ERROR cannot borrow `_` as mutable because it is also borrowed as immutable
drop(a);
let ref mut a @ (ref b, ref c) = (U, U); // FIXME: This should not compile.
let ref mut a @ (ref b, ref c) = (U, U);
//~^ ERROR cannot borrow `a` as immutable because it is also borrowed as mutable
}

237
src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
View File

@ -6,6 +6,219 @@ LL | #![feature(bindings_after_at)]
|
= note: `#[warn(incomplete_features)]` on by default
error: cannot borrow `z` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:11:9
|
LL | ref mut z @ &mut Some(ref a) => {
| ---------^^^^^^^^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:22:9
|
LL | let ref a @ ref mut b = U;
| -----^^^---------
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:24:9
|
LL | let ref mut a @ ref b = U;
| ---------^^^-----
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:26:9
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| -----^^^^---------^^---------^
| | | |
| | | mutable borrow occurs here
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:28:9
|
LL | let ref mut a @ (ref b, ref c) = (U, U);
| ---------^^^^-----^^-----^
| | | |
| | | immutable borrow occurs here
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:31:9
|
LL | let ref mut a @ ref b = U;
| ---------^^^-----
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:35:9
|
LL | let ref a @ ref mut b = U;
| -----^^^---------
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:41:9
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
| ---------^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:41:33
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) => {
| ---------^^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:50:9
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
| -----^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:50:33
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
| -----^^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:61:9
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
| -----^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:61:33
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
| -----^^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:68:9
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
| ---------^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:68:33
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
| ---------^^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:75:9
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
| -----^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:75:33
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
| -----^^^^^^^---------^
| | |
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:82:9
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
| ---------^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:82:33
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
| ---------^^^^^^^-----^
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:89:9
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| -----^^^^---------^^---------^
| | | |
| | | mutable borrow occurs here
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:9
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| -----^^^^---------^^---------^
| | | |
| | | mutable borrow occurs here
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:9
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| -----^^^^---------^^---------^
| | | |
| | | mutable borrow occurs here
| | mutable borrow occurs here
| immutable borrow occurs here
error: cannot borrow `a` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:106:9
|
LL | let ref mut a @ (ref b, ref c) = (U, U);
| ---------^^^^-----^^-----^
| | | |
| | | immutable borrow occurs here
| | immutable borrow occurs here
| mutable borrow occurs here
error[E0502]: cannot borrow `_` as immutable because it is also borrowed as mutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:11:31
|
@ -14,12 +227,12 @@ LL | ref mut z @ &mut Some(ref a) => {
| | |
| | immutable borrow occurs here
| mutable borrow occurs here
LL |
...
LL | **z = None;
| ---------- mutable borrow later used here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:43:20
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:50:20
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
| -----------^^^^^^^^^-
@ -31,7 +244,7 @@ LL | drop(a);
| - immutable borrow later used here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:43:45
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:50:45
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) => {
| ------------^^^^^^^^^-
@ -43,7 +256,7 @@ LL | drop(a);
| - immutable borrow later used here
error[E0594]: cannot assign to `*b`, as it is immutable for the pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:52:61
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:61:61
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false } => {}
| ^^^^^^ cannot assign
@ -51,7 +264,7 @@ LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { *b = U; false }
= note: variables bound in patterns are immutable until the end of the pattern guard
error[E0594]: cannot assign to `*a`, as it is immutable for the pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:57:61
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:68:61
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); false } => {}
| ^^^^^^^^^^^ cannot assign
@ -59,7 +272,7 @@ LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { *a = Err(U); fa
= note: variables bound in patterns are immutable until the end of the pattern guard
error[E0507]: cannot move out of `b` in pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:62:66
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:75:66
|
LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false } => {}
| ^ move occurs because `b` has type `&mut main::U`, which does not implement the `Copy` trait
@ -67,7 +280,7 @@ LL | ref a @ Ok(ref mut b) | ref a @ Err(ref mut b) if { drop(b); false
= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
error[E0507]: cannot move out of `a` in pattern guard
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:67:66
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:82:66
|
LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
| ^ move occurs because `a` has type `&mut std::result::Result<main::U, main::U>`, which does not implement the `Copy` trait
@ -75,7 +288,7 @@ LL | ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false
= note: variables bound in patterns cannot be moved from until after the end of the pattern guard
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:18
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:18
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| ---------^^^^^^^^^------------
@ -87,7 +300,7 @@ LL | drop(a);
| - immutable borrow later used here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:76:29
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:94:29
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| --------------------^^^^^^^^^-
@ -99,7 +312,7 @@ LL | drop(a);
| - immutable borrow later used here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:82:18
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:18
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| ---------^^^^^^^^^------------
@ -111,7 +324,7 @@ LL | drop(a);
| - immutable borrow later used here
error[E0502]: cannot borrow `_` as mutable because it is also borrowed as immutable
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:82:29
--> $DIR/borrowck-pat-ref-mut-and-ref.rs:101:29
|
LL | let ref a @ (ref mut b, ref mut c) = (U, U);
| --------------------^^^^^^^^^-
@ -122,7 +335,7 @@ LL | let ref a @ (ref mut b, ref mut c) = (U, U);
LL | drop(a);
| - immutable borrow later used here
error: aborting due to 11 previous errors
error: aborting due to 34 previous errors
Some errors have detailed explanations: E0502, E0507, E0594.
For more information about an error, try `rustc --explain E0502`.

40
src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-twice.rs
View File

@ -7,20 +7,32 @@ fn main() {
struct U;
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow `_` as mutable more than once at a time
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
drop(a);
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow `a` as mutable more than once at a time
drop(b);
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow `a` as mutable more than once at a time
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow `_` as mutable more than once at a time
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
*a = U;
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow `a` as mutable more than once at a time
*b = U;
let ref mut a @ (ref mut b, [ref mut c, ref mut d]) = (U, [U, U]);
// FIXME: This should not compile.
let ref mut a @ (
//~^ ERROR cannot borrow `a` as mutable more than once at a time
ref mut b,
[
ref mut c,
ref mut d,
ref e,
]
) = (U, [U, U, U]);
let a @ (ref mut b, ref mut c) = (U, U);
//~^ ERROR cannot bind by-move with sub-bindings
@ -39,18 +51,22 @@ fn main() {
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
// FIXME: This should not compile.
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `a` as mutable more than once at a time
}
}
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `a` as mutable more than once at a time
*b = U;
// FIXME: This should not compile.
}
}
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow `_` as mutable more than once at a time
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
*a = Err(U);
@ -60,7 +76,9 @@ fn main() {
}
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow `_` as mutable more than once at a time
//~^ ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `a` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
//~| ERROR cannot borrow `_` as mutable more than once at a time
drop(a);
}

171
src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-twice.stderr
View File

@ -6,30 +6,169 @@ LL | #![feature(bindings_after_at)]
|
= note: `#[warn(incomplete_features)]` on by default
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:9:9
|
LL | let ref mut a @ ref mut b = U;
| ---------^^^---------
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:13:9
|
LL | let ref mut a @ ref mut b = U;
| ---------^^^---------
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:16:9
|
LL | let ref mut a @ ref mut b = U;
| ---------^^^---------
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:19:9
|
LL | let ref mut a @ ref mut b = U;
| ---------^^^---------
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:23:9
|
LL | let ref mut a @ ref mut b = U;
| ---------^^^---------
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:27:9
|
LL | let ref mut a @ (
| ^--------
| |
| _________first mutable borrow occurs here
| |
LL | |
LL | | ref mut b,
| | --------- another mutable borrow occurs here
LL | | [
LL | | ref mut c,
| | --------- another mutable borrow occurs here
LL | | ref mut d,
| | --------- another mutable borrow occurs here
LL | | ref e,
| | ----- also borrowed as immutable here
LL | | ]
LL | | ) = (U, [U, U, U]);
| |_____^
error[E0007]: cannot bind by-move with sub-bindings
--> $DIR/borrowck-pat-ref-mut-twice.rs:25:9
--> $DIR/borrowck-pat-ref-mut-twice.rs:37:9
|
LL | let a @ (ref mut b, ref mut c) = (U, U);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ binds an already bound by-move value by moving it
error[E0007]: cannot bind by-move with sub-bindings
--> $DIR/borrowck-pat-ref-mut-twice.rs:29:9
--> $DIR/borrowck-pat-ref-mut-twice.rs:41:9
|
LL | let a @ (b, [c, d]) = &mut val; // Same as ^--
| ^^^^^^^^^^^^^^^ binds an already bound by-move value by moving it
error[E0007]: cannot bind by-move with sub-bindings
--> $DIR/borrowck-pat-ref-mut-twice.rs:33:9
--> $DIR/borrowck-pat-ref-mut-twice.rs:45:9
|
LL | let a @ &mut ref mut b = &mut U;
| ^^^^^^^^^^^^^^^^^^ binds an already bound by-move value by moving it
error[E0007]: cannot bind by-move with sub-bindings
--> $DIR/borrowck-pat-ref-mut-twice.rs:36:9
--> $DIR/borrowck-pat-ref-mut-twice.rs:48:9
|
LL | let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ binds an already bound by-move value by moving it
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:53:9
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:53:37
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:59:9
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:59:37
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:66:9
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:66:37
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:78:9
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error: cannot borrow `a` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:78:37
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------^^^^^^^---------^
| | |
| | another mutable borrow occurs here
| first mutable borrow occurs here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:9:21
|
@ -38,24 +177,24 @@ LL | let ref mut a @ ref mut b = U;
| | |
| | second mutable borrow occurs here
| first mutable borrow occurs here
LL |
...
LL | drop(a);
| - first borrow later used here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:16:21
--> $DIR/borrowck-pat-ref-mut-twice.rs:19:21
|
LL | let ref mut a @ ref mut b = U;
| ------------^^^^^^^^^
| | |
| | second mutable borrow occurs here
| first mutable borrow occurs here
LL |
...
LL | *a = U;
| ------ first borrow later used here
error[E0382]: borrow of moved value
--> $DIR/borrowck-pat-ref-mut-twice.rs:25:25
--> $DIR/borrowck-pat-ref-mut-twice.rs:37:25
|
LL | let a @ (ref mut b, ref mut c) = (U, U);
| ----------------^^^^^^^^^- ------ move occurs because value has type `(main::U, main::U)`, which does not implement the `Copy` trait
@ -64,7 +203,7 @@ LL | let a @ (ref mut b, ref mut c) = (U, U);
| value moved here
error[E0382]: borrow of moved value
--> $DIR/borrowck-pat-ref-mut-twice.rs:29:21
--> $DIR/borrowck-pat-ref-mut-twice.rs:41:21
|
LL | let a @ (b, [c, d]) = &mut val; // Same as ^--
| ------------^-- -------- move occurs because value has type `&mut (main::U, [main::U; 2])`, which does not implement the `Copy` trait
@ -73,7 +212,7 @@ LL | let a @ (b, [c, d]) = &mut val; // Same as ^--
| value moved here
error[E0382]: borrow of moved value
--> $DIR/borrowck-pat-ref-mut-twice.rs:33:18
--> $DIR/borrowck-pat-ref-mut-twice.rs:45:18
|
LL | let a @ &mut ref mut b = &mut U;
| ---------^^^^^^^^^ ------ move occurs because value has type `&mut main::U`, which does not implement the `Copy` trait
@ -82,7 +221,7 @@ LL | let a @ &mut ref mut b = &mut U;
| value moved here
error[E0382]: borrow of moved value
--> $DIR/borrowck-pat-ref-mut-twice.rs:36:30
--> $DIR/borrowck-pat-ref-mut-twice.rs:48:30
|
LL | let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
| ---------------------^^^^^^^^^- ----------- move occurs because value has type `&mut (main::U, main::U)`, which does not implement the `Copy` trait
@ -91,7 +230,7 @@ LL | let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
| value moved here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:52:24
--> $DIR/borrowck-pat-ref-mut-twice.rs:66:24
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------------^^^^^^^^^-
@ -103,7 +242,7 @@ LL | *a = Err(U);
| ----------- first borrow later used here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:52:53
--> $DIR/borrowck-pat-ref-mut-twice.rs:66:53
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ----------------^^^^^^^^^-
@ -115,7 +254,7 @@ LL | *a = Err(U);
| ----------- first borrow later used here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:62:24
--> $DIR/borrowck-pat-ref-mut-twice.rs:78:24
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ---------------^^^^^^^^^-
@ -127,7 +266,7 @@ LL | drop(a);
| - first borrow later used here
error[E0499]: cannot borrow `_` as mutable more than once at a time
--> $DIR/borrowck-pat-ref-mut-twice.rs:62:53
--> $DIR/borrowck-pat-ref-mut-twice.rs:78:53
|
LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
| ----------------^^^^^^^^^-
@ -138,7 +277,7 @@ LL | ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
LL | drop(a);
| - first borrow later used here
error: aborting due to 14 previous errors
error: aborting due to 28 previous errors
Some errors have detailed explanations: E0007, E0382, E0499.
For more information about an error, try `rustc --explain E0007`.