[SR-10077] Switching over duplicate enum case names won't compile #52479
Description
| Previous ID | SR-10077 |
| Radar | None |
| Original Reporter | xavier.lowmiller (JIRA User) |
| Type | Bug |
Additional Detail from JIRA
| Votes | 12 |
| Component/s | Compiler |
| Labels | Bug |
| Assignee | @slavapestov |
| Priority | Medium |
md5: 11bc61add2da06bf28b3399dd2617f81
Issue Description:
In Swift 4.2 (Xcode 10.1) and 5.0 (Xcode 10.2 beta 4), it's legal to define multiple identical enum cases as long as their associated value is different:
enum PictureImport { case add(image: UIImage) case add(data: Data) }This, however, leads to compile errors when switching:
func importImage(_ importedImage: PictureImport) { switch importedImage { case .add(image: let image): // Error: Tuple pattern element label 'image' must be 'data' // ... case .add(data: let data): // ... } }(Maybe related to #49402)
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A deviation from expected or documented behavior. Also: expected but undesirable behavior.The Swift compiler itselfFeature: declarationsFeature → type declarations: Swift enumeration declarationsFeature → enums: Enum casesFeature: Overloading symbol namesFeature: pattern matchingFeature: patternsArea → compiler: Semantic analysisBug: Unexpected error