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Clean up E0307 explanation #69055

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Feb 11, 2020
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Clean up E0307 explanation #69055

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20 changes: 17 additions & 3 deletions src/librustc_error_codes/error_codes/E0307.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,19 @@
This error indicates that the `self` parameter in a method has an invalid
"receiver type".
The `self` parameter in a method has an invalid "receiver type".

Erroneous code example:

```compile_fail,E0307
struct Foo;
struct Bar;

trait Trait {
fn foo(&self);
}

impl Trait for Foo {
fn foo(self: &Bar) {}
}
```

Methods take a special first parameter, of which there are three variants:
`self`, `&self`, and `&mut self`. These are syntactic sugar for
Expand Down Expand Up @@ -36,7 +50,7 @@ impl Trait for Foo {
}
```

E0307 will be emitted by the compiler when using an invalid receiver type,
This error will be emitted by the compiler when using an invalid receiver type,
like in the following example:

```compile_fail,E0307
Expand Down