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Better diagnostic when pattern matching tuple structs Fixes #108284 When trying to pattern match a tuple struct we might get a flawed error message if there are missing fields. E.g. ``` let x = Foo(100, 200); if let Foo { 0: bar } = x { ... } ``` Produces this error: ``` error[E0769]: tuple variant `Foo` written as struct variant --> hello.rs:5:12 | 5 | if let Foo { 0: foo } = x { | ^^^^^^^^^^^^^^ | help: use the tuple variant pattern syntax instead | 5 | if let Foo(_, _) = x { | ~~~~~~ ``` Which doesn't highlight that we can still use the struct syntax but we need to fill missing fields. This pr changes this error to: ``` error[E0027]: pattern does not mention field `1` --> hello.rs:5:12 | 5 | if let Foo { 0: foo } = x { | ^^^^^^^^^^^^^^ missing field `1` | help: include the missing field in the pattern | 5 | if let Foo { 0: foo, 1: _ } = x { | ~~~~~~~~ help: if you don't care about this missing field, you can explicitly ignore it | 5 | if let Foo { 0: foo, .. } = x { | ~~~~~~ ``` |
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