Fix conversion from bytes to fixed bytes

test/libsolidity/smtCheckerTests/typecast/bytes_to_fixed_bytes_1.sol

@@ -0,0 +1,22 @@
+contract C {
+	function f() external pure {
+		bytes memory b = hex"00010203040506070809000102030405060708090001020304050607080900010203040506070809";
+		bytes8 c = bytes8(b);
+		assert(c == 0x0001020304050607); // should hold
+		assert(c == 0x0001020304050608); // should fail
+		bytes16 d = bytes16(b);
+		assert(d == 0x00010203040506070809000102030405);
+		assert(d == 0x00010203040506070809000102030406); // should fail
+		bytes24 e = bytes24(b);
+		assert(e == 0x000102030405060708090001020304050607080900010203); // should hold
+		assert(e == 0x000102030405060708090001020304050607080900010204); // should fail
+		bytes32 g = bytes32(b);
+		assert(g == 0x0001020304050607080900010203040506070809000102030405060708090001); // should hold
+		assert(g == 0x0001020304050607080900010203040506070809000102030405060708090002); // should fail
+	}
+}
+// ----
+// Warning 6328: (225-256): CHC: Assertion violation happens here.\nCounterexample:\n\nc = 283686952306183\nd = 0\ne = 0\ng = 0\n\nTransaction trace:\nC.constructor()\nC.f()
+// Warning 6328: (352-399): CHC: Assertion violation happens here.\nCounterexample:\n\nc = 283686952306183\nd = 5233100606242806050944357496980485\ne = 0\ng = 0\n\nTransaction trace:\nC.constructor()\nC.f()
+// Warning 6328: (526-589): CHC: Assertion violation happens here.\nCounterexample:\n\nc = 283686952306183\nd = 5233100606242806050944357496980485\ne = 96533667595335344310996525432040024692804347064549891\ng = 0\n\nTransaction trace:\nC.constructor()\nC.f()
+// Warning 6328: (732-811): CHC: Assertion violation happens here.\nCounterexample:\n\nc = 283686952306183\nd = 5233100606242806050944357496980485\ne = 96533667595335344310996525432040024692804347064549891\ng = 1780731860627700044956966451854862080991451332659079878538166652776284161\n\nTransaction trace:\nC.constructor()\nC.f()

test/libsolidity/smtCheckerTests/typecast/slice_to_fixed_bytes_1.sol

@@ -0,0 +1,6 @@
+contract C {
+	function fromSlice(bytes calldata c) external pure returns (bytes32) {
+		return bytes32(c[0:33]);
+	}
+}
+// ----