Test for : KT-282 Nullability in extension functions and in binary calls

compiler/testData/checkerWithErrorTypes/quick/regressions/kt282.jet

@@ -0,0 +1,18 @@
+// KT-282 Nullability in extension functions and in binary calls
+
+class Set {
+    fun contains(x : Int) : Boolean = true
+}
+
+fun Set?.plus(x : Int) : Int = 1
+
+fun Int?.contains(x : Int) : Boolean = false
+
+fun f(): Unit {
+    var set : Set? = null
+    val i : Int? = null
+    i <!UNSAFE_INFIX_CALL!>+<!> 1
+    set + 1
+    1 <!UNSAFE_INFIX_CALL!>in<!> set
+    1 in 2
+}