File: multi-file-nested-type-circularity.swift

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// RUN: %empty-directory(%t)
// RUN: %target-swift-frontend -emit-module -module-name Multi -o %t/multi-file.swiftmodule -primary-file %s %S/Inputs/multi-file-nested-types.swift
// RUN: %target-swift-frontend -emit-module -module-name Multi -o %t/multi-file-2.swiftmodule %s -primary-file %S/Inputs/multi-file-nested-types.swift

// RUN: %target-swift-frontend -emit-module -module-name Multi %t/multi-file.swiftmodule %t/multi-file-2.swiftmodule -o %t -print-stats 2>&1 | %FileCheck %s
// RUN: %target-swift-frontend -emit-module -module-name Multi %t/multi-file-2.swiftmodule %t/multi-file.swiftmodule -o %t -print-stats 2>&1 | %FileCheck %s

// REQUIRES: asserts

// CHECK: Statistics
// CHECK: 1 Serialization - # of nested types resolved without full lookup

// Note the Optional here and below; this was once necessary to produce a crash.
// Without it, the type of the parameter is initialized "early" enough to not
// cause issues.
public func useTypes(_: Outer.Callback?) {}
extension Outer {
  public typealias Callback = (Outer.Inner) -> Void

  public func useTypes(_: Outer.Callback?) {}
}