overload_filtering.swift

// RUN: %target-typecheck-verify-swift -debug-constraints 2>%t.err
// RUN: %FileCheck %s < %t.err

// This test ensures that we are filtering out overloads based on argument
// labels, arity, etc., before those terms are visited. 

func foo(_: Int) { }
func foo(_: Int, _: Int) { }
func foo(_: Int, _: Int, _: Int) { }

func testModuleScope(i: Int) {
  // CHECK: (disabled disjunction term {{.*}} (Int) -> ()
  // CHECK-NEXT: (disabled disjunction term {{.*}} (Int, Int, Int) -> ()
  // CHECK: (introducing single enabled disjunction term {{.*}} (Int, Int) -> ()
  foo(i, i)
}

struct X {
  subscript(_: Int) -> Int { return 0 }
  subscript(_: Int, _: Int) -> Double { return 0 }
  subscript(_: Int, _: Int, _: Int) -> String { return "" }

  init(_: Int) { }
  init(_: Int, _: Int) { }
  init(_: Int, _: Int, _: Int) { }
}

func testSubscript(x: X, i: Int) {
  // CHECK: disabled disjunction term {{.*}}X.subscript(_:)
  // CHECK-NEXT: disabled disjunction term {{.*}}X.subscript(_:_:_:)
  // CHECK-NEXT: introducing single enabled disjunction term {{.*}} bound to decl overload_filtering.(file).X.subscript(_:_:)
  _ = x[i, i]
}

func testUnresolvedMember(i: Int) -> X {
  // CHECK: disabled disjunction term {{.*}} bound to decl overload_filtering.(file).X.init(_:)
  // CHECK-NEXT: disabled disjunction term {{.*}} bound to decl overload_filtering.(file).X.init(_:_:_:)
  // CHECK-NEXT: introducing single enabled disjunction term {{.*}} bound to decl overload_filtering.(file).X.init(_:_:)
  return .init(i, i)
}