Revert the change that made events accessible in other contacts via qualified access

Changelog.md

@@ -6,7 +6,6 @@ Important Bugfixes:
 
 Language Features:
  * Add `E.selector` for a non-anonymous event `E` to access the 32-byte selector topic.
- * Errors and Events allow qualified access from other contracts.
 
 
 Compiler Features:

libsolidity/ast/AST.h

@@ -1216,7 +1216,7 @@ public:
 	FunctionTypePointer functionType(bool /*_internal*/) const override;
 
 	bool isVisibleInDerivedContracts() const override { return true; }
-	bool isVisibleViaContractTypeAccess() const override { return true; }
+	bool isVisibleViaContractTypeAccess() const override { return false; /* TODO */ }
 
 	EventDefinitionAnnotation& annotation() const override;
 

test/libsolidity/semanticTests/events/event_selector.sol

@@ -7,32 +7,26 @@ library S {
 library T {
     event E();
 }
-interface I {
-    event E();
-}
 
 contract D {
     event F();
 }
 
 contract C is D {
-    function test1() external pure returns (bytes32, bytes32, bytes32) {
+    function test1() external pure returns (bytes32, bytes32) {
         assert(L.E.selector == T.E.selector);
-        assert(I.E.selector == L.E.selector);
 
         assert(L.E.selector != S.E.selector);
         assert(T.E.selector != S.E.selector);
-        assert(I.E.selector != S.E.selector);
 
-        return (L.E.selector, S.E.selector, I.E.selector);
+        return (L.E.selector, S.E.selector);
     }
 
     bytes32 s1 = L.E.selector;
     bytes32 s2 = S.E.selector;
     bytes32 s3 = T.E.selector;
-    bytes32 s4 = I.E.selector;
-    function test2() external returns (bytes32, bytes32, bytes32, bytes32) {
-        return (s1, s2, s3, s4);
+    function test2() external returns (bytes32, bytes32, bytes32) {
+        return (s1, s2, s3);
     }
 
     function test3() external returns (bytes32) {
@@ -42,6 +36,6 @@ contract C is D {
 // ====
 // compileViaYul: also
 // ----
-// test1() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028
-// test2() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028
+// test1() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0
+// test2() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028
 // test3() -> 0x28811f5935c16a099486acb976b3a6b4942950a1425a74e9eb3e9b7f7135e12a

test/libsolidity/semanticTests/events/simple.sol

@@ -2,7 +2,7 @@ contract C {
     event E();
 }
 
-contract Test {
+contract Test is C {
     event E(uint256, uint256);
     function f() public {
         emit C.E();

test/libsolidity/syntaxTests/events/event_selector_access_foreign_contract.sol

@@ -0,0 +1,11 @@
+contract D {
+    event E();
+}
+
+contract C {
+    function f() external pure returns (bytes32) {
+        return D.E.selector;
+    }
+}
+// ----
+// TypeError 9582: (110-113): Member "E" not found or not visible after argument-dependent lookup in type(contract D).

test/libsolidity/syntaxTests/events/event_selector_access_interface.sol

@@ -0,0 +1,11 @@
+interface I {
+    event E();
+}
+
+contract C {
+    function f() external pure returns (bytes32) {
+        return I.E.selector;
+    }
+}
+// ----
+// TypeError 9582: (111-114): Member "E" not found or not visible after argument-dependent lookup in type(contract I).

test/libsolidity/syntaxTests/events/event_selector_access_library.sol

@@ -0,0 +1,10 @@
+library L {
+    event E();
+}
+
+contract C {
+    function f() external pure returns (bytes32) {
+        return L.E.selector;
+    }
+}
+// ----

test/libsolidity/syntaxTests/events/event_selector_syntax.sol

@@ -7,33 +7,27 @@ library S {
 library T {
     event E();
 }
-interface I {
-    event E();
-}
 
 contract D {
     event F();
 }
 
 contract C is D {
-    function test1() external pure returns (bytes32, bytes32, bytes32) {
+    function test1() external pure returns (bytes32, bytes32) {
         assert(L.E.selector == T.E.selector);
-        assert(I.E.selector == L.E.selector);
 
         assert(L.E.selector != S.E.selector);
         assert(T.E.selector != S.E.selector);
-        assert(I.E.selector != S.E.selector);
 
-        return (L.E.selector, S.E.selector, I.E.selector);
+        return (L.E.selector, S.E.selector);
     }
 
     bytes32 s1 = L.E.selector;
     bytes32 s2 = S.E.selector;
     bytes32 s3 = T.E.selector;
-    bytes32 s4 = I.E.selector;
 
-    function test2() view external returns (bytes32, bytes32, bytes32, bytes32) {
-        return (s1, s2, s3, s4);
+    function test2() view external returns (bytes32, bytes32, bytes32) {
+        return (s1, s2, s3);
     }
 
     function test3() pure external returns (bytes32) {