Fix missing error when accessing unintialized variables.

test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/bug10821-for.sol

@@ -0,0 +1,9 @@
+contract Test {
+	function testFunc() external {
+		for (;;) {}
+		bytes storage b;
+		b[0] = 0x42;
+	}
+}
+// ----
+// TypeError 3464: (83-84): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/bug10821-if.sol

@@ -0,0 +1,13 @@
+contract Test {
+
+  struct Sample { bool flag; }
+  Sample public s;
+
+   function testFunc() external {
+        if(true){}
+        Sample storage t;
+        t.flag=true;
+    }
+}
+// ----
+// TypeError 3464: (155-156): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/bug10821-modifier.sol

@@ -0,0 +1,16 @@
+contract Test {
+
+  struct Sample { bool flag; }
+  Sample public s;
+
+  modifier checkAddr(address _a){
+      require(_a!=address(0));
+      _;
+  }
+  function testFunc(address _a) external checkAddr(_a) {
+        Sample storage t;
+        t.flag=true;
+    }
+}
+// ----
+// TypeError 3464: (237-238): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/bug10821-require.sol

@@ -0,0 +1,9 @@
+contract Test {
+	function testFunc() external {
+		require(true);
+		bytes storage b;
+		b[0] = 0x42;
+	}
+}
+// ----
+// TypeError 3464: (86-87): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/bug10821-while.sol

@@ -0,0 +1,9 @@
+contract Test {
+	function testFunc() external {
+		while (true) {}
+		bytes storage b;
+		b[0] = 0x42;
+	}
+}
+// ----
+// TypeError 3464: (87-88): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.