support multi-clause contracts (IDEA-93372)

java/java-tests/testData/inspection/dataFlow/fixture/ContractAnnotation.java

@@ -1,10 +1,16 @@
 import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.Nullable;
 
 import java.lang.*;
+import java.lang.AssertionError;
 import java.lang.IllegalArgumentException;
 
 public class AssertIsNotNull {
-  void bar() {
+  void bar(String s) {
+    if (<warning descr="Condition 's == null && trimIfNotNull(s) != null' is always 'false'">s == null && <warning descr="Condition 'trimIfNotNull(s) != null' is always 'false' when reached">trimIfNotNull(s) != null</warning></warning>) {
+      throw new AssertionError();
+    }
+
     final Object o = call();
     assertIsNotNull(o);
     if(<warning descr="Condition 'o == null' is always 'false'">o == null</warning>) {}
@@ -16,6 +22,14 @@ public class AssertIsNotNull {
       throw new IllegalArgumentException();
     }
   }
+
+  @Contract("null -> null; !null -> !null")
+  @Nullable static String trimIfNotNull(@Nullable String s) {
+    if (s == null) {
+      return null;
+    }
+    return s.trim();
+  }
   
   Object call() {return new Object();}
 }