[SR-3623] Overloading a property name on an object should succeed if property types differ

[swift-ci]

Previous ID	SR-3623
Radar	None
Original Reporter	federman (JIRA User)
Type	Bug

Additional Detail from JIRA

| | | |------------------|-----------------| |Votes | 0 | |Component/s | Compiler | |Labels | Bug, LanguageFeatureRequest | |Assignee | None | |Priority | Medium | md5: aafc357a03d201129bcb102591e19466

relates to:

• SR-1621 Protocol extension var { get } override implementation's let when type is implicit.

Issue Description:

Expected results:
Property overloading should work as well as method overloading. Declaring two variables with the same name but different types on an object should work.

Actual results:
Property overloading fails with the error message: "Invalid redeclaration of '\<propertyName>'".

Reproducible test case:

struct ThingVendor {}
struct Cow {}
struct Spaceship {}

extension ThingVendor {
    var something: Cow {
        return Cow()
    }
}

extension ThingVendor {
    var something: Spaceship {
        return Spaceship()
    }
}

Note if you find/replace "var something:" with "func something() ->", the code compiles.

Environment: Xcode 8.2.1 (8C1002) – Swift 3

[belkadan]

This sort of change would have to go through the Swift Evolution Process.