[SR-14547] Enum cases not shown in code completion for enum with associated values conforming to Error when Foundation is imported

[ahoppen]

Previous ID	SR-14547
Radar	rdar://problem/77263334
Original Reporter	@ahoppen
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	CodeCompletion
Labels	Bug, FoundByStressTester
Assignee	@ahoppen
Priority	Medium

md5: cbd6b69c0813e5e16d6650fffff54986

Issue Description:

Consider the following new test case:

// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=COMPLETE | %FileCheck %s

import Foundation

enum SomeError: Error {
  case validateStringIsNotUTF8(String)

  func foo() {
    switch self {
    case .#^COMPLETE^#validateStringIsNotUTF8(let value):
      break
    }
  }
}

// CHECK: Begin completions
// CHECK-DAG: Decl[EnumElement]/ExprSpecific/TypeRelation[Identical]: validateStringIsNotUTF8({#String#})[#SomeError#];
// CHECK: End completions

When completing on COMPLETE, we are suggesting

Begin completions, 2 items
Decl[AssociatedType]/CurrNominal/IsSystem: RawValue; name=RawValue
Decl[Constructor]/CurrNominal/IsSystem: init({#rawValue: FixedWidthInteger#})[#(_ErrorCodeProtocol & RawRepresentable)?#]; name=init(rawValue: FixedWidthInteger)
End completions

but not validateStringIsNotUTF8.

When import Foundation is removed, validateStringIsNotUTF8 is correctly suggested and the two results mentioned above no longer show up.

[ahoppen]

@swift-ci create

[ahoppen]

Fixed by #38627