test for already used var

test/org/jetbrains/java/decompiler/SingleClassesTest.java

@@ -117,6 +117,7 @@ public class SingleClassesTest {
   //@Test public void testSwitchOnStrings() { doTest("pkg/TestSwitchOnStrings");}
   //@Test public void testUnionType() { doTest("pkg/TestUnionType"); }
   //@Test public void testInnerClassConstructor2() { doTest("pkg/TestInner2"); }
+  //@Test public void testInUse() { doTest("pkg/TestInUse"); }
 
   private void doTest(String testFile, String... companionFiles) {
     ConsoleDecompiler decompiler = fixture.getDecompiler();

testData/results/TestInUse.dec

@@ -0,0 +1,53 @@
+package pkg;
+
+public class TestInUse {
+   public int getInt() {
+      return 42;// 5
+   }
+
+   protected int reuse() {
+      int i = 0;// 9
+      int d = 0;
+      int result = 0;// 10
+
+      do {
+         d = this.getInt();// 12
+         result -= d;// 13
+         ++i;// 15
+      } while(i < 10);
+
+      return result;// 16
+   }
+}
+
+class 'pkg/TestInUse' {
+   method 'getInt ()I' {
+      0      4
+      2      4
+   }
+
+   method 'reuse ()I' {
+      0      8
+      1      8
+      2      9
+      3      9
+      4      10
+      5      10
+      7      13
+      a      13
+      e      14
+      f      15
+      13      16
+      15      16
+      19      18
+   }
+}
+
+Lines mapping:
+5 <-> 5
+9 <-> 9
+10 <-> 11
+12 <-> 14
+13 <-> 15
+15 <-> 16
+16 <-> 19

testData/src/pkg/TestInUse.java

@@ -0,0 +1,18 @@
+package pkg;
+
+public class TestInUse {
+  public int getInt() {
+    return 42;
+  }
+
+  protected int reuse() {
+    int i = 0, d = 0;
+    int result = 0;
+    do {
+      d = getInt();
+      result -= d;
+    }
+    while (++i < 10);
+    return result;
+  }
+}