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[SR-8268] Unexpected Invalid Redeclaration #50799

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swift-ci opened this issue Jul 16, 2018 · 2 comments
Closed

[SR-8268] Unexpected Invalid Redeclaration #50799

swift-ci opened this issue Jul 16, 2018 · 2 comments

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@swift-ci
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swift-ci commented Jul 16, 2018

Previous ID SR-8268
Radar rdar://problem/56835019
Original Reporter oge (JIRA User)
Type Bug
Status Resolved
Resolution Won't Do
Environment

Latest Mac update, Swift Version 4.1

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: df87332af6d8eeadda1968dc3c7be7d0

Issue Description:

I was exploring some things with the swift language and came across this example:

// Swift Version: 4.1

// ---— Example 1 -— // No invalid redeclaration error
// I expected this
protocol VersionedProtocol {
associatedtype Version : VersionType
}

protocol VersionType {}
enum Version0x0x0 : VersionType {}
enum Version0x0x1: VersionType {}

extension VersionedProtocol where Version == Version0x0x0 {
func foo() {}
}

extension VersionedProtocol where Version == Version0x0x1 {
func foo() {}
}

// -— Example 2 --— // invalid redeclaration Foo
// I did not expect this
protocol VersionedProtocol {
associatedtype Version : VersionType
}

protocol VersionType {}
enum Version0x0x0 : VersionType {}
enum Version0x0x1: VersionType {}

extension VersionedProtocol where Version == Version0x0x0 {
typealias Foo = Int
}

extension VersionedProtocol where Version == Version0x0x1 {
typealias Foo = String
}

// I expected the errors in 3 and 4
// -— Example 3 --— // invalid redeclaration foo()
func foo() {}
func foo() {}

// -— Example 4 -— // invalid redeclaration Foo
typealias Foo = Int
typealias Foo = String

In example 3 and 4, I expect invalid redeclaration (specifically: invalid redeclaration foo() and invalid redeclaration Foo respectively), that makes sense to me. But why don't I get an invalid redeclaration in example 1 if I get an invalid redeclaration in example 2.

@belkadan
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belkadan commented Nov 2, 2019

@swift-ci create

@slavapestov
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slavapestov commented Nov 7, 2019

We allow overloading functions on generic requirements, but the rules for non-function declarations like nested types and properties are more restrictive.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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