Parent-Task:

• SR-14638 ☂️ Full support for overloaded enum cases (SE-0155)

Issue Description:

This issue manifests in library evolution mode only. It affects enums that have cases that differ in associated value labels only (i.e. they have the same base name, number, order, and types of associated values).

The following code:

public enum Foo {
  case foo(bar: Int)
  case foo(bas: Int)
}

when compiled in library evolution mode:

swiftc -enable-library-evolution -emit-library

does not contain an initializer for each enum case.

Running:

nm <library> | swift demangle

produces one symbol for:

S enum case for Foo.foo(Foo.Type) -> (Swift.Int) -> Foo

the expected number of such symbols is 2, one for each case in the enum.

The name mangling algorithm does not take associated value labels into account, therefore each initializer is emitted under the same mangled name by the compiler.