Swift/Linker error when ClassB uses a variable of type ClassA.SomeEnum when the enum has only 1 case

Number:rdar://19369147 Date Originated:2015/01/03
Status:Open Resolved:
Product:Xcode Product Version:6.1.1
Classification:Serious Bug Reproducible:Always
Given 'ClassA' that has an enum 'SomeEnum' with only one possible case, declaring a variable with a type of that enum in some other 'ClassB' causes a linker error: "Undefined symbols for architecture x86_64"

Adding a second case to the enum makes the linker error go away. Changing the var to a let also makes the error go away.

See the attached sample project, including the comments in the 'Achievements.swift' file.

Steps to Reproduce:
Run the attached sample project.

Expected Results:
Build should be successful.

Actual Results:
Build fails with error:
        Undefined symbols for architecture x86_64:
          "__TWvdvC11LinkerError14ViewController4taskOCS_12Achievements4Task", referenced from:
             __TFC11LinkerError14ViewControllerm4taskOCS_12Achievements4Task in ViewController.o
        ld: symbol(s) not found for architecture x86_64
        clang: error: linker command failed with exit code 1 (use -v to see invocation)

Xcode 6.1.1 (6A2008a) & Version 6.2 Beta 3 (6C101)

Sample Project:


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