Adding tests for conversion of calldata slices to memory and storage and fixing syntax tests.

test/libsolidity/semanticTests/array/calldata_array_as_argument_internal_function.sol

@@ -0,0 +1,19 @@
+pragma abicoder v2;
+contract Test {
+    function f(uint256[] calldata c) internal returns (uint a, uint b) {
+        return (c.length, c[0]);
+    }
+
+    function g(uint256[] calldata c) external returns (uint a, uint b) {
+        return f(c);
+    }
+
+    function h(uint256[] calldata c, uint start, uint end) external returns (uint a, uint b) {
+        return f(c[start: end]);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// g(uint256[]): 0x20, 4, 1, 2, 3, 4 -> 4, 1
+// h(uint256[], uint256, uint256): 0x60, 1, 3, 4, 1, 2, 3, 4 -> 2, 2

test/libsolidity/semanticTests/array/slices/array_slice_calldata_as_argument_of_external_calls.sol

@@ -0,0 +1,39 @@
+contract C {
+    function f1(bytes calldata c1, uint256 s, uint256 e, bytes calldata c2) public returns (bool) {
+        return keccak256(c1[s:e]) == keccak256(c2);
+    }
+
+    function f2(bytes calldata c, uint256 s) public returns (uint256, bytes memory) {
+        return abi.decode(c[s:], (uint256, bytes));
+    }
+
+    function f3(bytes calldata c1, uint256 s, uint256 e, bytes calldata c2) public returns (bool) {
+        bytes memory a = abi.encode(c1[s:e]);
+        bytes memory b = abi.encode(c2);
+        if (a.length != b.length) { return false; }
+        for (uint256 i = 0; i < a.length; i++) {
+            if (a[i] != b[i]) { return false; }
+        }
+        return true;
+    }
+
+    function f4(bytes calldata c1, uint256 s, uint256 e, bytes calldata c2) public returns (bool) {
+        bytes memory a = abi.encodePacked(c1[s:e]);
+        bytes memory b = abi.encodePacked(c2);
+        if (a.length != b.length) { return false; }
+        for (uint256 i = 0; i < a.length; i++) {
+            if (a[i] != b[i]) { return false; }
+        }
+        return true;
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f1(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcde" -> true
+// f1(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcdf" -> false
+// f2(bytes,uint256): 0x40, 0, 0x80, 0x21, 0x40, 0x7, "abcdefg" -> 0x21, 0x40, 0x7, "abcdefg"
+// f3(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcde" -> true
+// f3(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcdf" -> false
+// f4(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcde" -> true
+// f4(bytes,uint256,uint256,bytes): 0x80, 1, 5, 0xC0, 8, "abcdefgh", 4, "bcdf" -> false

test/libsolidity/semanticTests/array/slices/array_slice_calldata_to_memory.sol

@@ -0,0 +1,29 @@
+contract C {
+    function f(int[] calldata b, uint256 start, uint256 end) public returns (int) {
+        int[] memory m = b[start:end];
+        uint len = end - start;
+        assert(len == m.length);
+        for (uint i = 0; i < len; i++) {
+            assert(b[start:end][i] == m[i]);
+        }
+        return [b[start:end]][0][0];
+    }
+
+    function g(int[] calldata b, uint256 start, uint256 end) public returns (int[] memory) {
+        return b[start:end];
+    }
+
+    function h1(int[] memory b) internal returns (int[] memory) {
+        return b;
+    }
+
+    function h(int[] calldata b, uint256 start, uint256 end) public returns (int[] memory) {
+        return h1(b[start:end]);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f(int256[], uint256, uint256): 0x60, 1, 3, 4, 1, 2, 3, 4 -> 2
+// g(int256[], uint256, uint256): 0x60, 1, 3, 4, 1, 2, 3, 4 -> 0x20, 2, 2, 3
+// h(int256[], uint256, uint256): 0x60, 1, 3, 4, 1, 2, 3, 4 -> 0x20, 2, 2, 3

test/libsolidity/semanticTests/array/slices/array_slice_calldata_to_storage.sol

@@ -0,0 +1,16 @@
+contract C {
+    int[] s;
+    function f(int[] calldata b, uint256 start, uint256 end) public returns (int) {
+        s = b[start:end];
+        uint len = end - start;
+        assert(len == s.length);
+        for (uint i = 0; i < len; i++) {
+            assert(b[start:end][i] == s[i]);
+        }
+        return s[0];
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f(int256[], uint256, uint256): 0x60, 1, 3, 4, 1, 2, 3, 4 -> 2

test/libsolidity/syntaxTests/array/slice/assign_to_storage.sol

@@ -5,4 +5,3 @@ contract c {
   }
 }
 // ----
-// TypeError 7407: (63-74): Type bytes calldata slice is not implicitly convertible to expected type bytes storage ref.

test/libsolidity/syntaxTests/array/slice/calldata_dynamic_convert_to_memory.sol

@@ -1,7 +1,5 @@
 contract C {
-    function f(bytes calldata x) external {
-        bytes memory y = x[1:2];
+    function f(bytes calldata x) external pure returns (bytes memory) {
+        return x[1:2];
     }
 }
-// ----
-// TypeError 9574: (65-88): Type bytes calldata slice is not implicitly convertible to expected type bytes memory.

test/libsolidity/syntaxTests/array/slice/calldata_dynamic_forward.sol

@@ -4,4 +4,3 @@ contract C {
     }
 }
 // ----
-// TypeError 9553: (79-85): Invalid type for argument in function call. Invalid implicit conversion from bytes calldata slice to bytes memory requested.