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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
```
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23 lines
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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/issue-46604.rs:1:25
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LL | static buf: &mut [u8] = &mut [1u8,2,3,4,5,7];
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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[E0594]: cannot assign to `buf[_]`, as `buf` is an immutable static item
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--> $DIR/issue-46604.rs:6:5
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LL | static buf: &mut [u8] = &mut [1u8,2,3,4,5,7];
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| --------------------- this `static` cannot be written to
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...
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LL | buf[0]=2;
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| ^^^^^^^^ cannot assign
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0594, E0764.
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For more information about an error, try `rustc --explain E0594`.
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