Adding event and error selector fields on the lines of the function selector fields

test/libsolidity/semanticTests/error/error_selector.sol

@@ -0,0 +1,48 @@
+library L {
+    error E();
+}
+library S {
+    error E(uint);
+}
+library T {
+    error E();
+}
+
+error E();
+
+interface I {
+    error E();
+    function f() external pure;
+}
+
+contract D {
+    error F();
+}
+
+contract C is D {
+    function test1() public pure returns (bytes4, bytes4, bytes4, bytes4) {
+        assert(L.E.selector == T.E.selector);
+        assert(L.E.selector != S.E.selector);
+        assert(E.selector == L.E.selector);
+        assert(I.E.selector == L.E.selector);
+        return (L.E.selector, S.E.selector, E.selector, I.E.selector);
+    }
+
+    bytes4 s1 = L.E.selector;
+    bytes4 s2 = S.E.selector;
+    bytes4 s3 = T.E.selector;
+    bytes4 s4 = I.E.selector;
+    function test2() external returns (bytes4, bytes4, bytes4, bytes4) {
+        return (s1, s2, s3, s4);
+    }
+
+    function test3() external returns (bytes4) {
+        return (F.selector);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// test1() -> 0x92bbf6e800000000000000000000000000000000000000000000000000000000, 0x2ff06700000000000000000000000000000000000000000000000000000000, 0x92bbf6e800000000000000000000000000000000000000000000000000000000, 0x92bbf6e800000000000000000000000000000000000000000000000000000000
+// test2() -> 0x92bbf6e800000000000000000000000000000000000000000000000000000000, 0x2ff06700000000000000000000000000000000000000000000000000000000, 0x92bbf6e800000000000000000000000000000000000000000000000000000000, 0x92bbf6e800000000000000000000000000000000000000000000000000000000
+// test3() -> 0x28811f5900000000000000000000000000000000000000000000000000000000

test/libsolidity/semanticTests/events/event_selector.sol

@@ -0,0 +1,47 @@
+library L {
+    event E();
+}
+library S {
+    event E(uint);
+}
+library T {
+    event E();
+}
+interface I {
+    event E();
+}
+
+contract D {
+    event F();
+}
+
+contract C is D {
+    function test1() external pure returns (bytes32, 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);
+    }
+
+    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 test3() external returns (bytes32) {
+        return (F.selector);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// test1() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028
+// test2() -> 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x2ff0672f372fbe844b353429d4510ea5e43683af134c54f75f789ff57bc0c0, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028, 0x92bbf6e823a631f3c8e09b1c8df90f378fb56f7fbc9701827e1ff8aad7f6a028
+// test3() -> 0x28811f5935c16a099486acb976b3a6b4942950a1425a74e9eb3e9b7f7135e12a

test/libsolidity/semanticTests/events/simple.sol

@@ -0,0 +1,17 @@
+contract C {
+    event E();
+}
+
+contract Test {
+    event E(uint256, uint256);
+    function f() public {
+        emit C.E();
+        emit E(1,2);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f() ->
+// ~ emit E()
+// ~ emit E(uint256,uint256): 0x01, 0x02

test/libsolidity/syntaxTests/errors/error_selector_syntax.sol

@@ -0,0 +1,48 @@
+library L {
+    error E();
+}
+library S {
+    error E(uint);
+}
+library T {
+    error E();
+}
+
+error E();
+
+interface I {
+    error E();
+    function f() external pure;
+}
+
+contract D {
+    error F();
+}
+
+contract C is D {
+    function test1() public pure returns (bytes4, bytes4, bytes4, bytes4) {
+        assert(L.E.selector == T.E.selector);
+        assert(L.E.selector != S.E.selector);
+        assert(E.selector == L.E.selector);
+        assert(I.E.selector == L.E.selector);
+        return (L.E.selector, S.E.selector, E.selector, I.E.selector);
+    }
+
+    bytes4 s1 = L.E.selector;
+    bytes4 s2 = S.E.selector;
+    bytes4 s3 = T.E.selector;
+    bytes4 s4 = I.E.selector;
+
+    function test2() view external returns (bytes4, bytes4, bytes4, bytes4) {
+        return (s1, s2, s3, s4);
+    }
+
+    function test3() pure external returns (bytes4) {
+        return (F.selector);
+    }
+}
+// ----
+// Warning 2519: (16-26): This declaration shadows an existing declaration.
+// Warning 2519: (45-59): This declaration shadows an existing declaration.
+// Warning 2519: (78-88): This declaration shadows an existing declaration.
+// Warning 2519: (122-132): This declaration shadows an existing declaration.

test/libsolidity/syntaxTests/events/event_selector_library_called_inside_function.sol

@@ -0,0 +1,12 @@
+library Y {
+    event E() anonymous;
+}
+
+contract D {
+    function test1() external pure returns (bytes32) {
+        return Y.E.selector;
+    }
+
+}
+// ----
+// TypeError 9582: (123-135): Member "selector" not found or not visible after argument-dependent lookup in function ().

test/libsolidity/syntaxTests/events/event_selector_library_declared_outside_but_called_inside_function.sol

@@ -0,0 +1,13 @@
+library Y {
+    event E() anonymous;
+}
+
+contract C {
+    bytes32 s5 = Y.E.selector;
+
+    function test2() view external returns (bytes32) {
+        return s5;
+    }
+}
+// ----
+// TypeError 9582: (70-82): Member "selector" not found or not visible after argument-dependent lookup in function ().

test/libsolidity/syntaxTests/events/event_selector_syntax.sol

@@ -0,0 +1,43 @@
+library L {
+    event E();
+}
+library S {
+    event E(uint);
+}
+library T {
+    event E();
+}
+interface I {
+    event E();
+}
+
+contract D {
+    event F();
+}
+
+contract C is D {
+    function test1() external pure returns (bytes32, 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);
+    }
+
+    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 test3() pure external returns (bytes32) {
+        return (F.selector);
+    }
+}
+// ----