71b0755a98
Point at statics and consts being mutable borrowed or written to:
```
error[E0594]: cannot assign to immutable static item `NUM`
--> $DIR/E0594.rs:4:5
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LL | static NUM: i32 = 18;
| --------------- this `static` cannot be written to
...
LL | NUM = 20;
| ^^^^^^^^ cannot assign
```
Point at the expression that couldn't be mutably borrowed from a pattern:
```
error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/mut-pattern-of-immutable-borrow.rs:19:14
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LL | match &arg.field {
| ---------- this cannot be borrowed as mutable
LL | Some(ref mut s) => s.push('a'),
| ^^^^^^^^^ cannot borrow as mutable
```
62 lines
2.6 KiB
Text
62 lines
2.6 KiB
Text
warning: taking a mutable reference to a `const` item
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--> $DIR/E0017.rs:8:30
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LL | const CR: &'static mut i32 = &mut C;
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| ^^^^^^
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= note: each usage of a `const` item creates a new temporary
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= note: the mutable reference will refer to this temporary, not the original `const` item
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note: `const` item defined here
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--> $DIR/E0017.rs:5:1
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LL | const C: i32 = 2;
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| ^^^^^^^^^^^^
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= note: `#[warn(const_item_mutation)]` on by default
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error[E0764]: mutable borrows of temporaries that have their lifetime extended until the end of the program are not allowed
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--> $DIR/E0017.rs:8:30
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LL | const CR: &'static mut i32 = &mut C;
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| ^^^^^^ this mutable borrow refers to such a temporary
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= note: Temporaries in constants and statics can have their lifetime extended until the end of the program
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= note: To avoid accidentally creating global mutable state, such temporaries must be immutable
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= help: If you really want global mutable state, try replacing the temporary by an interior mutable `static` or a `static mut`
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error[E0596]: cannot borrow immutable static item `X` as mutable
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--> $DIR/E0017.rs:11:39
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LL | static X: i32 = 1;
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| ------------- this `static` cannot be borrowed as mutable
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...
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LL | static STATIC_REF: &'static mut i32 = &mut X;
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| ^^^^^^ cannot borrow as mutable
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warning: taking a mutable reference to a `const` item
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--> $DIR/E0017.rs:13:38
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LL | static CONST_REF: &'static mut i32 = &mut C;
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| ^^^^^^
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= note: each usage of a `const` item creates a new temporary
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= note: the mutable reference will refer to this temporary, not the original `const` item
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note: `const` item defined here
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--> $DIR/E0017.rs:5:1
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LL | const C: i32 = 2;
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| ^^^^^^^^^^^^
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error[E0764]: mutable borrows of temporaries that have their lifetime extended until the end of the program are not allowed
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--> $DIR/E0017.rs:13:38
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LL | static CONST_REF: &'static mut i32 = &mut C;
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| ^^^^^^ this mutable borrow refers to such a temporary
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= note: Temporaries in constants and statics can have their lifetime extended until the end of the program
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= note: To avoid accidentally creating global mutable state, such temporaries must be immutable
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= help: If you really want global mutable state, try replacing the temporary by an interior mutable `static` or a `static mut`
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error: aborting due to 3 previous errors; 2 warnings emitted
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Some errors have detailed explanations: E0596, E0764.
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For more information about an error, try `rustc --explain E0596`.
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