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Attempted to cast to/from a pointer with an unknown kind.
Erroneous code example:
```compile_fail,E0641
let b = 0 as *const _; // error
```
Type information must be provided if a pointer type being cast from/into another
type which cannot be inferred:
```
// Creating a pointer from reference: type can be inferred
let a = &(String::from("Hello world!")) as *const _; // ok!
let b = 0 as *const i32; // ok!
let c: *const i32 = 0 as *const _; // ok!
```
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