[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/extensions/kt3563.fir.kt

@@ -0,0 +1,17 @@
+// !WITH_NEW_INFERENCE
+// KT-3563 Compiler requiring java.io.File, and it's unclear why
+
+package bar
+
+import java.io.File
+
+class Customer(name1: String)
+
+fun foo(f: File, c: Customer) {
+    f.name1
+
+    c.<!INAPPLICABLE_CANDIDATE!>name1<!> // name1 should be unresolved here
+}
+
+val File.name1: String
+    get() = getName()