enhance tests (mostly codegen)

* drop dependency on stdlib/alt-headers in the most tests
* assign to myEnvironment at most once in JetLiteFixture
* more tests do not compile runtime

compiler/testData/codegen/classes/overloadPlusAssign.jet

@@ -12,7 +12,7 @@ class ArrayWrapper<T>() {
     }
 
     fun get(index: Int): T {
-        return contents.get(index)
+        return contents.get(index).sure()
     }
 }
 

compiler/testData/codegen/classes/overloadPlusAssignReturn.jet

@@ -15,7 +15,7 @@ class ArrayWrapper<T>() {
     }
 
     fun get(index: Int): T {
-        return contents.get(index)
+        return contents.get(index).sure()
     }
 }
 

compiler/testData/codegen/classes/overloadPlusToPlusAssign.jet

@@ -15,7 +15,7 @@ class ArrayWrapper<T>() {
     }
 
     fun get(index: Int): T {
-        return contents.get(index)
+        return contents.get(index).sure()
     }
 }
 

compiler/testData/codegen/classes/overloadUnaryOperator.jet

@@ -15,7 +15,7 @@ class ArrayWrapper<T>() {
     }
 
     fun get(index: Int): T {
-        return contents.get(index)
+        return contents.get(index).sure()
     }
 }
 

compiler/testData/codegen/controlStructures/forUserType.jet

@@ -19,28 +19,28 @@ fun box() : String {
     val c1: java.lang.Iterable<Int> = MyCollection1()
     sum = 0
     for (el in c1) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 15) return "c1 failed"
 
     val c2 = MyCollection1()
     sum = 0
     for (el in c2) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 15) return "c2 failed"
 
     val c3: Iterable<Int> = MyCollection2()
     sum = 0
     for (el in c3) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 15) return "c3 failed"
 
     val c4 = MyCollection2()
     sum = 0
     for (el in c4) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 15) return "c4 failed"
 
@@ -50,7 +50,7 @@ fun box() : String {
     }
     sum = 0
     for (el in a) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 10) return "a failed"
 
@@ -69,7 +69,7 @@ fun box() : String {
     val c7 = MyCollection5()
     sum = 0
     for (el in c7) {
-        sum = sum + el
+        sum = sum + el.sure()
     }
     if(sum != 0) return "c7 failed"
 

compiler/testData/codegen/regressions/kt471.kt

@@ -1,5 +1,3 @@
-import java.util.ArrayList
-
 class MyNumber(val i: Int) {
     fun inc(): MyNumber = MyNumber(i+1)
 }
@@ -52,25 +50,26 @@ fun test6() : Boolean {
     return true
 }
 
+class MyArrayList<T>(var value: T) {
+    fun get(index: Int): T {
+        if (index != 17)
+            throw Exception()
+        return value
+    }
+    fun set(index: Int, value: T): Unit {
+        if (index != 17)
+            throw Exception()
+        this.value = value
+    }
+}
+
 fun test7() : Boolean {
-    var mnr  = ArrayList<MyNumber>()
-    mnr.add(MyNumber(42))
-    mnr[0]++
-    if (mnr[0].i  != 43) return false
+    var mnr  = MyArrayList<MyNumber>(MyNumber(42))
+    mnr[17]++
+    if (mnr[17].i  != 43) return false
     return true
 }
 
-fun test8() : Boolean {
-    var mnr  = ArrayList<MyNumber>()
-    mnr.add(MyNumber(42))
-    mnr.add(MyNumber(41))
-    mnr[1] = mnr[0]++
-    if (mnr[0].i  != 43) return false
-    if (mnr[1].i  != 42) return false
-    return true
-}
-
-
 fun box() : String {
     var m  = MyNumber(42)
 
@@ -82,7 +81,6 @@ fun box() : String {
     if (!test5()) return "fail test 5"
     if (!test6()) return "fail test 6"
     if (!test7()) return "fail test 7"
-    if (!test8()) return "fail test 8"
 
 
     ++m

compiler/testData/codegen/regressions/kt475.jet

@@ -14,5 +14,5 @@ var <T> ArrayList<T>.length : Int
     set(value: Int) = throw java.lang.Error()
 
 var <T> ArrayList<T>.last : T
-    get() = get(size()-1)
+    get() = get(size()-1).sure()
     set(el : T) { set(size()-1, el) }

compiler/testData/codegen/super/basicmethodSuperClass.jet

@@ -1,7 +1,7 @@
 import java.util.ArrayList
 
 class N() : ArrayList<Any>() {
-    override fun add(el: Any)  : Boolean {
+    override fun add(el: Any?)  : Boolean {
         if (!super<ArrayList>.add(el)) {
             throw Exception()
         }