string comparison: evaluate based on equals comparison (IDEA-160823)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting6/ReachableWhileBodyDueToConstantStringComparison.java

@@ -0,0 +1,43 @@
+
+class Bar {
+  public static final String T = "";
+
+  void m0() {
+    while (T == "") {
+      f();
+    }
+    <error descr="Unreachable statement">f();</error>
+  }
+
+  void m() {
+    while (T == "a") {
+      <error descr="Unreachable statement">f();</error>
+    }
+  }
+
+  void m01() {
+    while (T != "") {
+      <error descr="Unreachable statement">f();</error>
+    }
+  }
+
+  void m1() {
+    while (T != "a") {
+      f();
+    }
+    <error descr="Unreachable statement">f();</error>
+  }
+
+  void m2() {
+    while (T != T) {
+      <error descr="Unreachable statement">f();</error>
+    }
+  }
+
+  void m3() {
+    while (T == T) {}
+    <error descr="Unreachable statement">f();</error>
+  }
+
+  private void f() {}
+}