Support array slices

test/libsolidity/smtCheckerTests/operators/slice.sol

@@ -0,0 +1,12 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(bytes calldata b) external pure {
+		require(b[10] == 0xff);
+		assert(bytes(b[10:20]).length == 10);
+		assert(bytes(b[10:20])[0] == 0xff);
+		assert(bytes(b[10:20])[5] == 0xff);
+	}
+}
+// ----
+// Warning 6328: (198-232): CHC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/operators/slice_default_end.sol

@@ -0,0 +1,17 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(bytes calldata b) external pure {
+		require(b.length == 30);
+		require(b[10] == 0xff);
+		require(b[b.length - 1] == 0xaa);
+		assert(bytes(b[10:]).length == 20);
+		assert(bytes(b[10:])[0] == 0xff);
+		assert(bytes(b[10:])[5] == 0xff);
+		assert(bytes(b[10:])[19] == 0xaa);
+	}
+}
+// ----
+// Warning 4661: (221-253): BMC: Assertion violation happens here.
+// Warning 4661: (257-289): BMC: Assertion violation happens here.
+// Warning 4661: (293-326): BMC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/operators/slice_default_start.sol

@@ -0,0 +1,13 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(bytes calldata b) external pure {
+		require(b[0] == 0xff);
+		assert(bytes(b[:20]).length == 20);
+		assert(bytes(b[:20])[0] == 0xff);
+		assert(bytes(b[:20])[5] == 0xff);
+	}
+}
+// ----
+// Warning 6328: (193-225): CHC: Assertion violation happens here.
+// Warning 4661: (157-189): BMC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/operators/slices_1.sol

@@ -8,6 +8,3 @@ contract C {
 	}
 }
 // ----
-// Warning 2923: (94-109): Assertion checker does not yet implement this expression.
-// Warning 2923: (113-128): Assertion checker does not yet implement this expression.
-// Warning 2923: (132-165): Assertion checker does not yet implement this expression.

test/libsolidity/smtCheckerTests/special/abi_encode_slice.sol

@@ -5,5 +5,4 @@ contract C {
 	}
 }
 // ----
-// Warning 2923: (143-152): Assertion checker does not yet implement this expression.
 // Warning 4588: (126-154): Assertion checker does not yet implement this type of function call.

test/libsolidity/smtCheckerTests/typecast/slice_to_bytes.sol

@@ -8,6 +8,3 @@ contract C {
 	}
 }
 // ----
-// Warning 2923: (100-115): Assertion checker does not yet implement this expression.
-// Warning 2923: (126-141): Assertion checker does not yet implement this expression.
-// Warning 2923: (152-185): Assertion checker does not yet implement this expression.