Struct member access for storage and memory.

test/libsolidity/semanticTests/getters/mapping_to_struct.sol

@@ -0,0 +1,20 @@
+contract C {
+    struct S {
+        uint8 a;
+        uint16 b;
+        uint128 c;
+        uint d;
+    }
+    mapping(uint => mapping(uint => S)) public x;
+    constructor() public {
+        x[1][2].a = 3;
+        x[1][2].b = 4;
+        x[1][2].c = 5;
+        x[1][2].d = 6;
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// x(uint256,uint256): 1, 2 -> 3, 4, 5, 6
+// x(uint256,uint256): 0, 0 -> 0x00, 0x00, 0x00, 0x00

test/libsolidity/semanticTests/storage/accessors_mapping_for_array.sol

@@ -12,6 +12,6 @@ contract test {
 // compileViaYul: also
 // ----
 // data(uint256,uint256): 2, 2 -> 8
-// data(uint256,uint256): 2, 8 -> FAILURE  # NB: the original code contained a bug here #
+// data(uint256,uint256): 2, 8 -> FAILURE # NB: the original code contained a bug here #
 // dynamicData(uint256,uint256): 2, 2 -> 8
 // dynamicData(uint256,uint256): 2, 8 -> FAILURE

test/libsolidity/semanticTests/storage/struct_accessor.sol

@@ -8,5 +8,7 @@ contract test {
         data[7].d = true;
     }
 }
+// ====
+// compileViaYul: also
 // ----
 // data(uint256): 7 -> 1, 2, true