Effective visibility: java package-private is now considered as equivalent to Kotlin internal #KT-9755 Fixed

compiler/testData/diagnostics/tests/exposed/packagePrivate.kt

@@ -0,0 +1,35 @@
+// FILE: test/My.java
+
+package test;
+
+class Internal {}
+
+public class My {
+    static public Internal foo() { return new Internal(); }
+}
+
+// FILE: test/His.kt
+
+package test
+
+class His {
+    // Ok: private vs package-private
+    private fun private() = My.foo()
+    // Ok: internal vs package-private in same package
+    internal fun internal() = My.foo()
+    // Error: protected vs package-private
+    protected fun <!EXPOSED_FUNCTION_RETURN_TYPE!>protected<!>() = My.foo()
+    // Error: public vs package-private
+    fun <!EXPOSED_FUNCTION_RETURN_TYPE!>public<!>() = My.foo()
+}
+
+// FILE: other/Your.kt
+
+package other
+
+import test.My
+
+class Your {
+    // Ok but dangerous: internal vs package-private in different package
+    internal fun bar() = My.foo()
+}

compiler/testData/diagnostics/tests/exposed/packagePrivate.txt

@@ -0,0 +1,36 @@
+package
+
+package other {
+
+    public final class Your {
+        public constructor Your()
+        internal final fun bar(): test.Internal!
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+package test {
+
+    public final class His {
+        public constructor His()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        internal final fun internal(): test.Internal!
+        private final fun private(): test.Internal!
+        protected final fun protected(): test.Internal!
+        public final fun public(): test.Internal!
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public open class My {
+        public constructor My()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        // Static members
+        public open fun foo(): test.Internal!
+    }
+}