e0e70c0c2c
Suggest tuple-parentheses for enum variants This follows on from #86493 / #86481, making the parentheses suggestion. To summarise, given the following code: ```rust fn f() -> Option<(i32, i8)> { Some(1, 2) } ``` The current output is: ``` error[E0061]: this enum variant takes 1 argument but 2 arguments were supplied --> b.rs:2:5 | 2 | Some(1, 2) | ^^^^ - - supplied 2 arguments | | | expected 1 argument error: aborting due to previous error For more information about this error, try `rustc --explain E0061`. ``` With this change, `rustc` will now suggest parentheses when: - The callee is expecting a single tuple argument - The number of arguments passed matches the element count in the above tuple - The arguments' types match the tuple's fields ``` error[E0061]: this enum variant takes 1 argument but 2 arguments were supplied --> b.rs:2:5 | 2 | Some(1, 2) | ^^^^ - - supplied 2 arguments | help: use parentheses to construct a tuple | 2 | Some((1, 2)) | + + ``` |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.