isEffectivelyFinal: disallow effectively final variables to be initialized twice (IDEA-165060)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeMayBeNotInitializedAndThusNotEffectivelyFinal.java

@@ -0,0 +1,20 @@
+// "Replace with collect" "false"
+
+import java.util.ArrayList;
+import java.util.List;
+
+class Main {
+  public List<Integer> test(boolean b, List<String> list) {
+    int s;
+    if(b) {
+      s = 1;
+    }
+    List<Integer> result = new ArrayList<>();
+    for(String str : li<caret>st) {
+      if(str != null) {
+        result.add(s++);
+      }
+    }
+    return result;
+  }
+}