Becca Royal-Gordon 93188f81cc Stub fix-its for missing objcImpl requirements ...

Changes the diagnostics emitted when an `@objc @implementation` extension is missing some of the members required by the extension:

• We now emit one error on the extension, plus a note for each missing member.
• Where possible, we also emit a note with a fix-it adding stubs.

For example:

```
  9 | @objc @implementation extension ObjCClass {
    |                       |- error: extension for main class interface does not provide all required implementations
    |                       |- note: missing instance method 'method(fromHeader3:)'
    |                       |- note: missing instance method 'method(fromHeader4:)'
    |                       |- note: missing property 'propertyFromHeader7'
    |                       |- note: missing property 'propertyFromHeader8'
    |                       |- note: missing property 'propertyFromHeader9'
    |                       |- note: missing instance method 'extensionMethod(fromHeader2:)'
    |                       `- note: add stubs for missing '@implementation' requirements
```

With a fix-it on the last note to insert the following after the open brace:

```

  @objc(methodFromHeader3:)
  open func method(fromHeader3 param: Int32) {
      <#code#>
  }

  @objc(methodFromHeader4:)
  open func method(fromHeader4 param: Int32) {
      <#code#>
  }

  @objc(propertyFromHeader7)
  open var propertyFromHeader7: Int32 {
      get {
          <#code#>
      }
      set {
          <#code#>
      }
  }

  @objc(propertyFromHeader8)
  open var propertyFromHeader8: Int32 {
      get {
          <#code#>
      }
      set {
          <#code#>
      }
  }

  @objc(propertyFromHeader9)
  open var propertyFromHeader9: Int32 {
      get {
          <#code#>
      }
      set {
          <#code#>
      }
  }

  @objc(extensionMethodFromHeader2:)
  open func extensionMethod(fromHeader2 param: Int32) {
      <#code#>
  }

```

Fixes rdar://130038221.

2025-04-07 17:53:15 -07:00

1.2 KiB

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