[FIR TEST] Stabilize top-level extension vs outer member behavior

compiler/fir/resolve/testData/resolve/expresssions/topExtensionVsOuterMember.kt

@@ -0,0 +1,10 @@
+fun Outer.Inner.foo() = 42
+
+class Outer {
+
+    fun foo() = ""
+
+    inner class Inner {
+        val x = foo() // Should be Int
+    }
+}

compiler/fir/resolve/testData/resolve/expresssions/topExtensionVsOuterMember.txt

@@ -0,0 +1,24 @@
+FILE: topExtensionVsOuterMember.kt
+    public final fun R|Outer.Inner|.foo(): R|kotlin/Int| {
+        ^foo Int(42)
+    }
+    public final class Outer : R|kotlin/Any| {
+        public constructor(): R|Outer| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final fun foo(): R|kotlin/String| {
+            ^foo String()
+        }
+
+        public final inner class Inner : R|kotlin/Any| {
+            public constructor(): R|Outer.Inner| {
+                super<R|kotlin/Any|>()
+            }
+
+            public final val x: R|kotlin/Int| = this@R|/Outer.Inner|.R|/foo|()
+                public get(): R|kotlin/Int|
+
+        }
+
+    }

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java

@@ -684,6 +684,11 @@ public class FirDiagnosticsTestGenerated extends AbstractFirDiagnosticsTest {
             runTest("compiler/fir/resolve/testData/resolve/expresssions/this.kt");
         }
 
+        @TestMetadata("topExtensionVsOuterMember.kt")
+        public void testTopExtensionVsOuterMember() throws Exception {
+            runTest("compiler/fir/resolve/testData/resolve/expresssions/topExtensionVsOuterMember.kt");
+        }
+
         @TestMetadata("typeAliasConstructor.kt")
         public void testTypeAliasConstructor() throws Exception {
             runTest("compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.kt");

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java

@@ -684,6 +684,11 @@ public class FirDiagnosticsWithLightTreeTestGenerated extends AbstractFirDiagnos
             runTest("compiler/fir/resolve/testData/resolve/expresssions/this.kt");
         }
 
+        @TestMetadata("topExtensionVsOuterMember.kt")
+        public void testTopExtensionVsOuterMember() throws Exception {
+            runTest("compiler/fir/resolve/testData/resolve/expresssions/topExtensionVsOuterMember.kt");
+        }
+
         @TestMetadata("typeAliasConstructor.kt")
         public void testTypeAliasConstructor() throws Exception {
             runTest("compiler/fir/resolve/testData/resolve/expresssions/typeAliasConstructor.kt");