IDEA-111450 false positive for "Redundant type cast" inspection

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/IDEA111450.java

@@ -0,0 +1,38 @@
+import java.lang.Character;
+import java.util.List;
+
+public class Test {
+  public static void test() {
+    Character c1 = '1';
+    Character c2 = '2';
+    Object o = '3';
+
+    // A cast on either operand is required to force a primitive comparison; not redundant.
+    System.out.println((char) c1 == c2);
+    System.out.println(c1 == (char) c2);
+
+    // If one operand is a primitive, and the other is a wrapper, the wrapper need not be cast.
+    System.out.println((<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1 == '*');
+    System.out.println('*' == (<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1);
+
+    // The cast on the Object is required to force a primitive comparison; not redundant.
+    System.out.println((char) o == '*');
+    System.out.println('*' == (char) o);
+
+    // The cast on the Object is required to force a primitive comparison; not redundant.
+    System.out.println((Character) o == '*');
+    System.out.println('*' == (Character) o);
+
+    // The cast on the Object triggers an implicit unboxing of the wrapper; not redundant.
+    System.out.println((char) o == c1);
+    System.out.println(c1 == (char) o);
+
+    // A cast on the Object is required for a primitive comparison, but the wrapper cast is redundant.
+    System.out.println((char) o == (<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1);
+    System.out.println((<warning descr="Casting 'c1' to 'char' is redundant">char</warning>) c1 == (char) o);
+
+    // Although a reference comparison, the cast on the wrapper has a side effect; not redundant.
+    System.out.println(o == (char) c1);
+    System.out.println((char) c1 == o);
+  }
+}