diagnostic tests changes after collections mapping

compiler/testData/codegen/regressions/kt1120.kt

@@ -1,5 +1,4 @@
 import java.util.concurrent.ConcurrentLinkedQueue
-import java.util.List
 
 public object RefreshQueue {
     private val queue = ConcurrentLinkedQueue<List<String>>

compiler/testData/codegen/regressions/kt1406.kt

@@ -1,6 +1,5 @@
 package pack
 
-import java.util.Collection
 import java.util.ArrayList
 import java.util.regex.Pattern
 

compiler/testData/codegen/regressions/kt1800.kt

@@ -1,7 +1,6 @@
 //KT-1800 error/NonExistentClass generated on runtime
 package i
 
-import java.util.Collection
 import java.util.ArrayList
 
 public class User(val firstName: String,

compiler/testData/codegen/regressions/kt2390.kt

@@ -1,4 +1,3 @@
-import java.util.Collection
 
 class JsonObject() {
 }

compiler/testData/codegen/regressions/kt2399.kt

@@ -1,4 +1,3 @@
-import java.util.Collection
 import java.util.ArrayList
 
 class JsonObject {

compiler/testData/codegen/regressions/kt504.jet

@@ -1,12 +1,11 @@
 import java.util.HashMap
-import java.util.Map
 import java.io.*
 
-fun <K, V> Map<K, V>.set(key : K, value : V) = put(key, value)
+fun <K, V> MutableMap<K, V>.set(key : K, value : V) = put(key, value)
 
 fun box() : String {
 
-    val commands : Map<String, String> = HashMap()
+    val commands : MutableMap<String, String> = HashMap()
 
     commands["c1"]  = "239"
     if(commands["c1"] != "239") return "fail"

compiler/testData/codegen/regressions/kt903.jet

@@ -1,11 +1,10 @@
 import java.util.ArrayList
-import java.util.List
 
 fun Int.plus(a: Int?) = this + a.sure()
 
 public open class PerfectNumberFinder() {
         open public fun isPerfect(number : Int) : Boolean {
-            var factors : List<Int?> = ArrayList<Int?>()
+            var factors : MutableList<Int?> = ArrayList<Int?>()
             factors?.add(1)
             factors?.add(number)
             for (i in 2..(Math.sqrt((number).toDouble()) - 1).toInt())

compiler/testData/codegen/regressions/kt910.kt

@@ -1,4 +1,3 @@
-import java.util.Set
 import java.util.HashSet
 
 fun foo() : Int =
@@ -9,7 +8,7 @@ fun foo() : Int =
         "s"
     }
 
-fun bar(set : Set<Int>) : Set<Int> =
+fun bar(set : MutableSet<Int>) : Set<Int> =
     try {
         set
     }