Fixed KT-5204 Converter from java could generate var's for locals when needed

#KT-5204 Fixed

j2k/src/org/jetbrains/jet/j2k/AfterConversionPass.kt

@@ -27,6 +27,7 @@ import org.jetbrains.jet.lang.diagnostics.Diagnostic
 import org.jetbrains.jet.lang.diagnostics.Errors
 import org.jetbrains.jet.lang.psi.JetSimpleNameExpression
 import org.jetbrains.jet.lang.psi.JetUnaryExpression
+import org.jetbrains.jet.lang.psi.JetProperty
 
 class AfterConversionPass(val project: Project) {
     public fun run(kotlinCode: String): String {
@@ -58,13 +59,21 @@ class AfterConversionPass(val project: Project) {
     }
 
     private fun fixForProblem(problem: Diagnostic): (() -> Unit)? {
+        val psiElement = problem.getPsiElement()
         return when (problem.getFactory()) {
             Errors.UNNECESSARY_NOT_NULL_ASSERTION -> { () ->
-                val exclExclOp = problem.getPsiElement() as JetSimpleNameExpression
+                val exclExclOp = psiElement as JetSimpleNameExpression
                 val exclExclExpr = exclExclOp.getParent() as JetUnaryExpression
                 exclExclExpr.replace(exclExclExpr.getBaseExpression()!!)
             }
 
+            Errors.VAL_REASSIGNMENT -> { () ->
+                val property = (psiElement as? JetSimpleNameExpression)?.getReference()?.resolve() as? JetProperty
+                if (property != null && !property.isVar()) {
+                    property.getValOrVarNode().getPsi()!!.replace(JetPsiFactory.createVarNode(project).getPsi()!!)
+                }
+            }
+
             else -> null
         }
     }

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

@@ -2037,6 +2037,11 @@ public class JavaToKotlinConverterTestGenerated extends AbstractJavaToKotlinConv
             doTest("j2k/tests/testData/ast/localVariable/varTypeDoNotMatch.java");
         }
         
+        @TestMetadata("varWithNoInitializer.java")
+        public void testVarWithNoInitializer() throws Exception {
+            doTest("j2k/tests/testData/ast/localVariable/varWithNoInitializer.java");
+        }
+        
     }
     
     @TestMetadata("j2k/tests/testData/ast/methodCallExpression")

j2k/tests/testData/ast/localVariable/varWithNoInitializer.java

@@ -0,0 +1,11 @@
+//file
+class C {
+    int foo(boolean p) {
+        int a;
+        int b;
+        a = 10;
+        b = 5;
+        if (p) a = 5; else b = 10;
+        return a + b;
+    }
+}

j2k/tests/testData/ast/localVariable/varWithNoInitializer.kt

@@ -0,0 +1,10 @@
+class C {
+    fun foo(p: Boolean): Int {
+        var a: Int
+        var b: Int
+        a = 10
+        b = 5
+        if (p) a = 5 else b = 10
+        return a + b
+    }
+}