diff --git a/src/Type/Constant/ConstantArrayType.php b/src/Type/Constant/ConstantArrayType.php
index fbb1217057..028698e42b 100644
--- a/src/Type/Constant/ConstantArrayType.php
+++ b/src/Type/Constant/ConstantArrayType.php
@@ -29,6 +29,8 @@
 use PHPStan\Type\Accessory\NonEmptyArrayType;
 use PHPStan\Type\ArrayType;
 use PHPStan\Type\BooleanType;
+use PHPStan\Type\CallableType;
+use PHPStan\Type\ClosureType;
 use PHPStan\Type\CompoundType;
 use PHPStan\Type\ConstantScalarType;
 use PHPStan\Type\ErrorType;
@@ -167,7 +169,26 @@ public function getIterableValueType(): Type
 			return $this->iterableValueType;
 		}
 
-		return $this->iterableValueType = count($this->valueTypes) > 0 ? TypeCombinator::union(...$this->valueTypes) : new NeverType(true);
+		$count = count($this->valueTypes);
+		if ($count === 0) {
+			return $this->iterableValueType = new NeverType(true);
+		}
+
+		if ($count > 16) {
+			$onlyClosureValues = true;
+			foreach ($this->valueTypes as $valueType) {
+				if (!$valueType instanceof ClosureType) {
+					$onlyClosureValues = false;
+					break;
+				}
+			}
+
+			if ($onlyClosureValues) {
+				return $this->iterableValueType = new CallableType();
+			}
+		}
+
+		return $this->iterableValueType = TypeCombinator::union(...$this->valueTypes);
 	}
 
 	public function getKeyType(): Type
diff --git a/tests/PHPStan/Analyser/AnalyserIntegrationTest.php b/tests/PHPStan/Analyser/AnalyserIntegrationTest.php
index a3e9095a89..fed5cb2c75 100644
--- a/tests/PHPStan/Analyser/AnalyserIntegrationTest.php
+++ b/tests/PHPStan/Analyser/AnalyserIntegrationTest.php
@@ -1570,6 +1570,12 @@ public function testBug13714(): void
 		$this->assertSame('Function Bug13714\array_find invoked with 2 parameters, 0 required.', $errors[6]->getMessage());
 	}
 
+	public function testBug13933(): void
+	{
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-13933.php');
+		$this->assertNoErrors($errors);
+	}
+
 	/**
 	 * @param string[]|null $allAnalysedFiles
 	 * @return list<Error>
diff --git a/tests/PHPStan/Analyser/data/bug-13933.php b/tests/PHPStan/Analyser/data/bug-13933.php
new file mode 100644
index 0000000000..023c61bad3
--- /dev/null
+++ b/tests/PHPStan/Analyser/data/bug-13933.php
@@ -0,0 +1,246 @@
+<?php
+
+namespace Bug13933;
+
+$list = [];
+
+$list['a-1'] = static function (): A { return new A(); };
+$list['a-2'] = static function (): B { return new B(); };
+$list['a-3'] = static function (): C { return new C(); };
+$list['a-4'] = static function (): D { return new D(); };
+$list['a-5'] = static function (): E { return new E(); };
+$list['a-6'] = static function (): F { return new F(); };
+// Beta
+$list['b-1'] = static function (): A1 { return new A1(); };
+$list['b-2'] = static function (): B1 { return new B1(); };
+$list['b-3'] = static function (): C1 { return new C1(); };
+$list['b-4'] = static function (): D1 { return new D1(); };
+$list['b-5'] = static function (): E1 { return new E1(); };
+$list['b-6'] = static function (): F1 { return new F1(); };
+// Delta
+$list['c-1'] = static function (): A2 { return new A2(); };
+$list['c-2'] = static function (): B2 { return new B2(); };
+$list['c-3'] = static function (): C2 { return new C2(); };
+$list['c-4'] = static function (): D2 { return new D2(); };
+$list['c-5'] = static function (): E2 { return new E2(); };
+$list['c-6'] = static function (): F2 { return new F2(); };
+// Epsilon
+$list['d-1'] = static function (): A3 { return new A3(); };
+$list['d-2'] = static function (): B3 { return new B3(); };
+$list['d-3'] = static function (): C3 { return new C3(); };
+$list['d-4'] = static function (): D3 { return new D3(); };
+$list['d-5'] = static function (): E3 { return new E3(); };
+$list['d-6'] = static function (): F3 { return new F3(); };
+// Eta
+$list['e-1'] = static function (): A4 { return new A4(); };
+$list['e-2'] = static function (): B4 { return new B4(); };
+$list['e-3'] = static function (): C4 { return new C4(); };
+$list['e-4'] = static function (): D4 { return new D4(); };
+$list['e-5'] = static function (): E4 { return new E4(); };
+$list['e-6'] = static function (): F4 { return new F4(); };
+// Gamma
+$list['f-1'] = static function (): A5 { return new A5(); };
+$list['f-2'] = static function (): B5 { return new B5(); };
+$list['f-3'] = static function (): C5 { return new C5(); };
+$list['f-4'] = static function (): D5 { return new D5(); };
+$list['f-5'] = static function (): E5 { return new E5(); };
+$list['f-6'] = static function (): F5 { return new F5(); };
+// Iota
+$list['g-1'] = static function (): A6 { return new A6(); };
+$list['g-2'] = static function (): B6 { return new B6(); };
+$list['g-3'] = static function (): C6 { return new C6(); };
+$list['g-4'] = static function (): D6 { return new D6(); };
+$list['g-5'] = static function (): E6 { return new E6(); };
+$list['g-6'] = static function (): F6 { return new F6(); };
+// Kappa
+$list['h-1'] = static function (): A7 { return new A7(); };
+$list['h-2'] = static function (): B7 { return new B7(); };
+$list['h-3'] = static function (): C7 { return new C7(); };
+$list['h-4'] = static function (): D7 { return new D7(); };
+$list['h-5'] = static function (): E7 { return new E7(); };
+$list['h-6'] = static function (): F7 { return new F7(); };
+// Lambda
+$list['i-1'] = static function (): A8 { return new A8(); };
+$list['i-2'] = static function (): B8 { return new B8(); };
+$list['i-3'] = static function (): C8 { return new C8(); };
+$list['i-4'] = static function (): D8 { return new D8(); };
+$list['i-5'] = static function (): E8 { return new E8(); };
+$list['i-6'] = static function (): F8 { return new F8(); };
+// Theta
+$list['j-1'] = static function (): A9 { return new A9(); };
+$list['j-2'] = static function (): B9 { return new B9(); };
+$list['j-3'] = static function (): C9 { return new C9(); };
+$list['j-4'] = static function (): D9 { return new D9(); };
+$list['j-5'] = static function (): E9 { return new E9(); };
+$list['j-6'] = static function (): F9 { return new F9(); };
+// Zeta
+$list['k-1'] = static function (): A10 { return new A10(); };
+$list['k-2'] = static function (): B10 { return new B10(); };
+$list['k-3'] = static function (): C10 { return new C10(); };
+$list['k-4'] = static function (): D10 { return new D10(); };
+$list['k-5'] = static function (): E10 { return new E10(); };
+$list['k-6'] = static function (): F10 { return new F10(); };
+//
+$list['l-1'] = static function (): A11 { return new A11(); };
+$list['l-2'] = static function (): B11 { return new B11(); };
+$list['l-3'] = static function (): C11 { return new C11(); };
+$list['l-4'] = static function (): D11 { return new D11(); };
+$list['l-5'] = static function (): E11 { return new E11(); };
+$list['l-6'] = static function (): F11 { return new F11(); };
+//
+$list['m-1'] = static function (): A12 { return new A12(); };
+$list['m-2'] = static function (): B12 { return new B12(); };
+$list['m-3'] = static function (): C12 { return new C12(); };
+$list['m-4'] = static function (): D12 { return new D12(); };
+$list['m-5'] = static function (): E12 { return new E12(); };
+$list['m-6'] = static function (): F12 { return new F12(); };
+//
+$list['n-1'] = static function (): A13 { return new A13(); };
+$list['n-2'] = static function (): B13 { return new B13(); };
+$list['n-3'] = static function (): C13 { return new C13(); };
+$list['n-4'] = static function (): D13 { return new D13(); };
+$list['n-5'] = static function (): E13 { return new E13(); };
+$list['n-6'] = static function (): F13 { return new F13(); };
+//
+$list['o-1'] = static function (): A14 { return new A14(); };
+$list['o-2'] = static function (): B14 { return new B14(); };
+$list['o-3'] = static function (): C14 { return new C14(); };
+$list['o-4'] = static function (): D14 { return new D14(); };
+$list['o-5'] = static function (): E14 { return new E14(); };
+$list['o-6'] = static function (): F14 { return new F14(); };
+//
+$list['p-1'] = static function (): A15 { return new A15(); };
+$list['p-2'] = static function (): B15 { return new B15(); };
+$list['p-3'] = static function (): C15 { return new C15(); };
+$list['p-4'] = static function (): D15 { return new D15(); };
+$list['p-5'] = static function (): E15 { return new E15(); };
+$list['p-6'] = static function (): F15 { return new F15(); };
+//
+$list['q-1'] = static function (): A16 { return new A16(); };
+$list['q-2'] = static function (): B16 { return new B16(); };
+$list['q-3'] = static function (): C16 { return new C16(); };
+$list['q-4'] = static function (): D16 { return new D16(); };
+$list['q-5'] = static function (): E16 { return new E16(); };
+$list['q-6'] = static function (): F16 { return new F16(); };
+
+
+print 1;
+
+class A {}
+class B {}
+class C {}
+class D {}
+class E {}
+class F {}
+
+class A1 {}
+class B1 {}
+class C1 {}
+class D1 {}
+class E1 {}
+class F1 {}
+
+class A2 {}
+class B2 {}
+class C2 {}
+class D2 {}
+class E2 {}
+class F2 {}
+
+class A3 {}
+class B3 {}
+class C3 {}
+class D3 {}
+class E3 {}
+class F3 {}
+
+class A4 {}
+class B4 {}
+class C4 {}
+class D4 {}
+class E4 {}
+class F4 {}
+
+class A5 {}
+class B5 {}
+class C5 {}
+class D5 {}
+class E5 {}
+class F5 {}
+
+class A6 {}
+class B6 {}
+class C6 {}
+class D6 {}
+class E6 {}
+class F6 {}
+
+class A7 {}
+class B7 {}
+class C7 {}
+class D7 {}
+class E7 {}
+class F7 {}
+
+class A8 {}
+class B8 {}
+class C8 {}
+class D8 {}
+class E8 {}
+class F8 {}
+
+class A9 {}
+class B9 {}
+class C9 {}
+class D9 {}
+class E9 {}
+class F9 {}
+
+class A10 {}
+class B10 {}
+class C10 {}
+class D10 {}
+class E10 {}
+class F10 {}
+
+class A11 {}
+class B11 {}
+class C11 {}
+class D11 {}
+class E11 {}
+class F11 {}
+
+class A12 {}
+class B12 {}
+class C12 {}
+class D12 {}
+class E12 {}
+class F12 {}
+
+class A13 {}
+class B13 {}
+class C13 {}
+class D13 {}
+class E13 {}
+class F13 {}
+
+class A14 {}
+class B14 {}
+class C14 {}
+class D14 {}
+class E14 {}
+class F14 {}
+
+class A15 {}
+class B15 {}
+class C15 {}
+class D15 {}
+class E15 {}
+class F15 {}
+
+class A16 {}
+class B16 {}
+class C16 {}
+class D16 {}
+class E16 {}
+class F16 {}