Merge pull request #6080 from ethereum/library-index-access

Disallow index access on contracts and libraries

test/libsolidity/syntaxTests/array/contract_array.sol

@@ -0,0 +1,11 @@
+contract C {
+    C[] y = new C[](3);
+    C[3] x;
+    function f() public {
+        C[3] memory z;
+        y.push(this);
+        x[0] = this;
+        z[0] = this;
+    }
+}
+

test/libsolidity/syntaxTests/array/invalid/contract_index_access.sol

@@ -0,0 +1,7 @@
+contract C {
+    function f() view public {
+        C[0];
+    }
+}
+// ----
+// TypeError: (52-56): Index access for contracts or libraries is not possible.

test/libsolidity/syntaxTests/array/invalid/library_index_access.sol

@@ -0,0 +1,7 @@
+library C {
+    function f() view public {
+        C[0];
+    }
+}
+// ----
+// TypeError: (51-55): Index access for contracts or libraries is not possible.