test for KT-9454

idea/testData/findUsages/kotlin/findPropertyUsages/extensionPropertyUsages.0.kt

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtProperty
+// OPTIONS: usages
+@file:JvmName("AKt")
+
+val String.<caret>x: Int get() = 1

idea/testData/findUsages/kotlin/findPropertyUsages/extensionPropertyUsages.1.java

@@ -0,0 +1,5 @@
+public class JavaClass {
+    public static void main() {
+        AKt.getX("");
+    }
+}

idea/testData/findUsages/kotlin/findPropertyUsages/extensionPropertyUsages.results.txt

@@ -0,0 +1 @@
+Unclassified usage 3 AKt.getX("");