[Sol->Yul] Implementing struct copying from memory to storage

test/libsolidity/semanticTests/structs/calldata/calldata_struct_to_memory.sol

@@ -4,15 +4,16 @@ contract C {
     struct S {
         uint256 a;
         uint256 b;
+        bytes2 c;
     }
 
-    function f(S calldata s) external pure returns (uint256, uint256) {
+    function f(S calldata s) external pure returns (uint256, uint256, byte) {
         S memory m = s;
-        return (m.a, m.b);
+        return (m.a, m.b, m.c[1]);
     }
 }
 
 // ====
 // compileViaYul: also
 // ----
-// f((uint256,uint256)): 42, 23 -> 42, 23
+// f((uint256,uint256, bytes2)): 42, 23, "ab" -> 42, 23, "b"

test/libsolidity/semanticTests/structs/struct_memory_to_storage.sol

@@ -0,0 +1,28 @@
+pragma experimental ABIEncoderV2;
+
+contract C {
+    struct S {
+        uint32 a;
+        uint128 b;
+        uint256 c;
+    }
+
+    struct X {
+        uint256 a;
+        S s;
+    }
+
+    uint[79] r;
+    X x;
+
+    function f() external returns (uint32, uint128, uint256) {
+        X memory m = X(12, S(42, 23, 34));
+        x = m;
+        return (x.s.a, x.s.b, x.s.c);
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// f() -> 42, 23, 34

test/libsolidity/semanticTests/structs/struct_named_constructor.sol

@@ -10,5 +10,7 @@ contract C {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // s() -> 1, true