Mappings.

test/libsolidity/semanticTests/viaYul/storage/mappings.sol

@@ -0,0 +1,39 @@
+contract C {
+    mapping(uint => uint) simple;
+    mapping(uint16 => uint) cleanup;
+    mapping(string => uint) str;
+    mapping(uint => mapping(uint => uint)) twodim;
+    function test_simple(uint _off) public returns (uint _a, uint _b, uint _c) {
+        simple[_off + 2] = 3;
+        simple[_off + 3] = 4;
+        simple[uint(-1)] = 5;
+        _c = simple[uint(-1)];
+        _b = simple[3 + _off];
+        _a = simple[2 + _off];
+    }
+    function test_cleanup() public returns (bool) {
+        uint16 x;
+        assembly { x := 0xffff0001 }
+        cleanup[x] = 3;
+        return cleanup[1] == 3;
+    }
+    function test_str() public returns (bool) {
+        str["abc"] = 3;
+        string memory s = "abc";
+        return str[s] == 3;
+    }
+    function test_twodim() public returns (uint a, uint b) {
+        twodim[2][3] = 3;
+        a = twodim[3][2];
+        b = twodim[2][3];
+    }
+}
+// ====
+// compileViaYul: true
+// ----
+// test_simple(uint256): 0 -> 3, 4, 5
+// test_simple(uint256): 1 -> 3, 4, 5
+// test_simple(uint256): 2 -> 3, 4, 5
+// test_cleanup() -> true
+// test_str() -> true
+// test_twodim() -> 0, 3