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Here follows the main reverts applied in order to make this commit:
Revert "Rollup merge of #60676 - davidtwco:issue-60674, r=cramertj"
This reverts commit 45b09453dbf120cc23d889435aac3ed7d2ec8eb7, reversing
changes made to f6df1f6c30b469cb9e65c5453a0efa03cbb6005e.
Revert "Rollup merge of #60437 - davidtwco:issue-60236, r=nikomatsakis"
This reverts commit 16939a50ea440e72cb6ecefdaabb988addb1ec0e, reversing
changes made to 12bf98155249783583a91863c5dccf9e346f1226.
Revert "Rollup merge of #59823 - davidtwco:issue-54716, r=cramertj"
This reverts commit 62d1574876f5531bce1b267e62dff520d7adcbbb, reversing
changes made to 4eff8526a789e0dfa8b97f7dec91b7b5c18e8544.
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Recover gracefully from argument with missing type or param name
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Move a bunch of error recovery methods to `diagnostics.rs` away from
`parser.rs`.
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Mention that `self` is only valid on "associated functions"
```
error: unexpected `self` argument in function
--> $DIR/self-in-function-arg.rs:1:15
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LL | fn foo(x:i32, self: i32) -> i32 { self }
| ^^^^ not valid as function argument
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= note: `self` is only valid as the first argument of an associated function
```
When it is a method, mention it must be first
```
error: unexpected `self` argument in function
--> $DIR/trait-fn.rs:4:20
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LL | fn c(foo: u32, self) {}
| ^^^^ must be the first associated function argument
```
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Adds notes pointing at the non-nullary variants, and uses "custom
discriminant" language to be consistent with the Reference.
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- Change wording of suggestion
- Move recovery logic to `diagnostics.rs`
- Reduce ammount of code duplication
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parser.rs is too big. Some functions only for error reporting and error
recovery are being moved to diagostics.rs.
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