KT-9601, KT-10103:

Chose maximally specific function in callable reference
 #KT-9601 Fixed
 #KT-10103 Fixed

compiler/testData/diagnostics/tests/callableReference/resolve/moreSpecificSimple.kt

@@ -0,0 +1,12 @@
+// !CHECK_TYPE
+
+interface IA
+interface IB : IA
+
+fun IA.extFun() {}
+fun IB.extFun() {}
+
+fun test() {
+    val extFun = IB::extFun
+    checkSubtype<IB.() -> Unit>(extFun)
+}