Added sameType check for fromType and toType in YulUtilFunctions.cpp and relevant tests in semanticTests

test/libsolidity/semanticTests/array/copying/array_of_function_external_storage_to_storage_dynamic.sol

@@ -0,0 +1,43 @@
+contract C {
+    function testFunction1() public {}
+    function testFunction2() public {}
+    function testFunction3() public {}
+
+
+    function() external [3] externalArray0;
+    function() external [3] externalArray1 = [
+        this.testFunction1,
+        this.testFunction2,
+        this.testFunction3
+    ];
+
+    function copyExternalStorageArrayOfFunctionType() external returns (bool) {
+        assert(keccak256(abi.encode(externalArray0)) != keccak256(abi.encode(externalArray1)));
+        externalArray0 = externalArray1;
+        return keccak256(abi.encode(externalArray0)) == keccak256(abi.encode(externalArray1));
+    }
+
+    function() internal [3] internalArray0;
+    function() internal [3] internalArray1 = [
+        testFunction1,
+        testFunction2,
+        testFunction3
+    ];
+
+    function copyInternalArrayOfFunctionType() external returns (bool) {
+        internalArray0 = internalArray1;
+        assert(internalArray0.length == 3);
+
+        return
+        internalArray0.length == internalArray1.length &&
+        internalArray0[0] == internalArray1[0] &&
+        internalArray0[1] == internalArray1[1] &&
+        internalArray0[2] == internalArray1[2];
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// copyExternalStorageArrayOfFunctionType() -> true
+// gas legacy: 103412
+// copyInternalArrayOfFunctionType() -> true

test/libsolidity/semanticTests/array/copying/array_of_function_external_storage_to_storage_dynamic_different_mutability.sol

@@ -0,0 +1,45 @@
+contract C {
+    function testFunction1() public {}
+    function testFunction2() public view {}
+    function testFunction3() public pure {}
+
+    function() external [3] externalArray0;
+    function() external [3] externalArray1 = [
+        this.testFunction1,
+        this.testFunction2,
+        this.testFunction3
+    ];
+
+    function copyExternalStorageArraysOfFunctionType() external returns (bool)
+    {
+        assert(keccak256(abi.encodePacked(externalArray0)) != keccak256(abi.encodePacked(externalArray1)));
+        externalArray0 = externalArray1;
+        return keccak256(abi.encodePacked(externalArray0)) == keccak256(abi.encodePacked(externalArray1));
+    }
+
+    function() internal [3] internalArray0;
+    function() internal [3] internalArray1 = [
+        testFunction1,
+        testFunction2,
+        testFunction3
+    ];
+
+    function copyInternalArrayOfFunctionType() external returns (bool)
+    {
+        internalArray0 = internalArray1;
+        assert(internalArray0.length == 3);
+
+        return
+        internalArray0.length == internalArray1.length &&
+        internalArray0[0] == internalArray1[0] &&
+        internalArray0[1] == internalArray1[1] &&
+        internalArray0[2] == internalArray1[2];
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// copyExternalStorageArraysOfFunctionType() -> true
+// gas legacy: 103398
+// copyInternalArrayOfFunctionType() -> true
+// gas legacy: 104178

test/libsolidity/semanticTests/array/copying/copy_function_internal_storage_array.sol

@@ -18,6 +18,6 @@ contract C {
 // compileViaYul: also
 // ----
 // test() -> 7
-// gas irOptimized: 126552
+// gas irOptimized: 124080
 // gas legacy: 205196
 // gas legacyOptimized: 204987