Java to Kotlin converter: fixed exception on conversion

j2k/src/org/jetbrains/jet/j2k/visitors/StatementVisitor.kt

@@ -176,13 +176,8 @@ open class StatementVisitor(public val converter: Converter) : JavaElementVisito
     }
 
     override fun visitForeachStatement(statement: PsiForeachStatement) {
-        val iterator = run {
-            val iteratorExpr = converter.convertExpression(statement.getIteratedValue())
-            if (iteratorExpr.isNullable)
-                BangBangExpression(iteratorExpr)
-            else
-                iteratorExpr
-        }
+        val iteratorExpr = converter.convertExpression(statement.getIteratedValue())
+        val iterator = if (iteratorExpr.isNullable) BangBangExpression(iteratorExpr).assignNoPrototype() else iteratorExpr
         result = ForeachStatement(converter.convertParameter(statement.getIterationParameter()),
                                   iterator,
                                   convertStatementOrBlock(statement.getBody()),

j2k/tests/test/org/jetbrains/jet/j2k/test/JavaToKotlinConverterTestGenerated.java

@@ -1300,6 +1300,11 @@ public class JavaToKotlinConverterTestGenerated extends AbstractJavaToKotlinConv
             doTest("j2k/tests/testData/ast/foreachStatement/enhancedForWithReturn.java");
         }
         
+        @TestMetadata("nullableIterable.java")
+        public void testNullableIterable() throws Exception {
+            doTest("j2k/tests/testData/ast/foreachStatement/nullableIterable.java");
+        }
+        
     }
     
     @TestMetadata("j2k/tests/testData/ast/formatting")

j2k/tests/testData/ast/foreachStatement/nullableIterable.java

@@ -0,0 +1,12 @@
+//file
+import java.util.List;
+
+class A {
+    List<String> list = null;
+
+    void foo() {
+        for (String e : list) {
+            System.out.println(e);
+        }
+    }
+}

j2k/tests/testData/ast/foreachStatement/nullableIterable.kt

@@ -0,0 +1,9 @@
+class A {
+    var list: List<String>? = null
+
+    fun foo() {
+        for (e in list!!) {
+            System.out.println(e)
+        }
+    }
+}