KT-4820: Intention to remove an unused index variable from a for loop.

idea/testData/intentions/removeForLoopIndicesIntention/inapplicableIndexUse.kt

@@ -0,0 +1,7 @@
+// IS_APPLICABLE: FALSE
+//ERROR: Unresolved reference: withIndices
+fun foo(b: List<Int>) {
+    for ((i, <caret>c) in b.withIndices()) {
+        return i
+    }
+}