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clean up E0641 explanation #72942

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Jun 3, 2020
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clean up E0641 explanation #72942

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12 changes: 6 additions & 6 deletions src/librustc_error_codes/error_codes/E0641.md
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Original file line number Diff line number Diff line change
@@ -1,19 +1,19 @@
Attempted to cast to/from a pointer with an unknown kind.

Erroneous code examples:
Erroneous code example:

```compile_fail,E0641
let b = 0 as *const _; // error
```

Must give information for type of pointer that is being cast from/to if the
type cannot be inferred.
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 a = &(String::from("Hello world!")) as *const _; // ok!

let b = 0 as *const i32; // Ok
let b = 0 as *const i32; // ok!

let c: *const i32 = 0 as *const _; // Ok
let c: *const i32 = 0 as *const _; // ok!
```