KT-1560

Report warning on extensions shadowed by members.

compiler/testData/diagnostics/tests/callableReference/emptyLhs.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -UNUSED_EXPRESSION
+// !DIAGNOSTICS: -UNUSED_EXPRESSION, -EXTENSION_SHADOWED_BY_MEMBER
 
 val topLevelVal = 1
 fun topLevelFun() = 2

compiler/testData/diagnostics/tests/callableReference/function/noAmbiguityMemberVsExtension.kt

@@ -6,7 +6,7 @@ class A {
     fun foo() = 42
 }
 
-fun A.foo() {}
+fun A.<!EXTENSION_SHADOWED_BY_MEMBER!>foo<!>() {}
 
 fun main() {
     val x = A::foo

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

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !DIAGNOSTICS: -UNUSED_PARAMETER, -EXTENSION_SHADOWED_BY_MEMBER
 
 import kotlin.reflect.*