[2201.9.x] Fix getting non-accessible symbol error for error intersections with details

compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/semantics/analyzer/Types.java

@@ -5690,8 +5690,8 @@ private BErrorType createErrorType(BType lhsType, BType rhsType, BType detailTyp
         BErrorType lhsErrorType = (BErrorType) lhsType;
         BErrorType rhsErrorType = (BErrorType) rhsType;
 
-        BErrorType errorType = createErrorType(detailType, lhsType.flags, env);
-        errorType.tsymbol.flags |= rhsType.flags;
+        long flags = lhsType.flags | rhsType.flags | Flags.PUBLIC;  // Anonymous (generated) types are marked as public.
+        BErrorType errorType = createErrorType(detailType, flags, env);
 
         errorType.typeIdSet = BTypeIdSet.getIntersection(lhsErrorType.typeIdSet, rhsErrorType.typeIdSet);
 

tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/types/intersection/IntersectionTypeTest.java

@@ -264,6 +264,13 @@ public void testUnsupportedIntersectionNegative() {
         assertEquals(result.getErrorCount(), index);
     }
 
+    @Test
+    public void testErrorIntersectionAccessTest() {
+        CompileResult result = BCompileUtil.compile("test-src/types/intersection/error-intersection-access");
+        assertEquals(result.getErrorCount(), 0);
+        BRunUtil.invoke(result, "testErrorIntersectionFromImportedModule");
+    }
+
     @AfterClass
     public void tearDown() {
         readOnlyIntersectionResults = null;

tests/jballerina-unit-test/src/test/resources/test-src/types/intersection/error-intersection-access/Ballerina.toml

@@ -0,0 +1,7 @@
+[package]
+org = "testorg"
+name = "error_intersection_access"
+version = "0.1.0"
+
+[build-options]
+observabilityIncluded = true

tests/jballerina-unit-test/src/test/resources/test-src/types/intersection/error-intersection-access/error_intersection_access_test.bal

@@ -0,0 +1,56 @@
+// Copyright (c) 2024, WSO2 LLC. (https://www.wso2.com).
+//
+// WSO2 LLC. licenses this file to you under the Apache License,
+// Version 2.0 (the "License"); you may not use this file except
+// in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import error_intersection_access.error_intersection_mod as err_lib;
+
+const MESSAGE = "Message";
+
+public function testErrorIntersectionFromImportedModule() {
+    err_lib:RemoteServerError remoteServerErr = error err_lib:RemoteServerError(MESSAGE);
+    assertError(remoteServerErr);
+
+    err_lib:ApplicationResponseError applResponeErr = error err_lib:ApplicationResponseError(MESSAGE);
+    assertError(applResponeErr);
+
+    err_lib:ClientRequestErrorWithStatusCode clientReqErrWithStatusCode = error (MESSAGE, code = 404);
+    assertError(clientReqErrWithStatusCode, 404);
+
+    err_lib:ApplicationResponseErrorWithStatusCode appRespErrWithStatusCode = error (MESSAGE, code = 401);
+    assertError(appRespErrWithStatusCode, 401);
+
+    err_lib:BadRequestError badReqErr = error err_lib:BadRequestError(MESSAGE, code = 400);
+    assertError(badReqErr, 400);
+
+    err_lib:Error err = error err_lib:Error(MESSAGE);
+    assertError(err);
+}
+
+function assertError(any|error actual, int? code = ()) {
+    if actual !is error {
+        panic error(string `expected an error, found '${actual.toString()}'`);
+    }
+
+    if MESSAGE != actual.message() {
+        panic error(string `expected message: '${MESSAGE}', found: '${actual.message()}'`);
+    }
+
+    if code != () {
+        var detail = <record {|int code;|} & readonly> actual.detail();
+        if code != detail.code {
+            panic error(string `expected code: '${code}', found: '${detail.code}'`);
+        }
+    }
+}

tests/jballerina-unit-test/src/test/resources/test-src/types/intersection/error-intersection-access/modules/error_intersection_mod/error_intersection_mod.bal

@@ -0,0 +1,33 @@
+// Copyright (c) 2024, WSO2 LLC. (https://www.wso2.com).
+//
+// WSO2 LLC. licenses this file to you under the Apache License,
+// Version 2.0 (the "License"); you may not use this file except
+// in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+public type Status record {
+    int code;
+};
+
+public type Error distinct error;
+
+public type ClientRequestError distinct Error & error;
+
+public type RemoteServerError distinct error & error;
+
+public type ApplicationResponseError distinct ClientRequestError & RemoteServerError;
+
+public type ApplicationResponseErrorWithStatusCode distinct ApplicationResponseError & error<Status>;
+
+public type ClientRequestErrorWithStatusCode distinct ClientRequestError & error<Status>;
+
+public type BadRequestError distinct ApplicationResponseErrorWithStatusCode & ClientRequestErrorWithStatusCode;