added ConstraintSystemTest

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/rendering/Renderers.java

@@ -376,7 +376,7 @@ public class Renderers {
                 typeBounds.add(constraintSystem.getTypeBounds(variable));
             }
             Function<TypeBounds, String> renderTypeBounds = rendererToFunction(RENDER_TYPE_BOUNDS);
-            return "type parameter bounds: \n" + StringUtil.join(typeBounds, renderTypeBounds, ";\n") + "\n" +
+            return "type parameter bounds:\n" + StringUtil.join(typeBounds, renderTypeBounds, ";\n") + "\n" +
                    "status:\n" + ConstraintsUtil.getDebugMessageForStatus(constraintSystem.getStatus());
         }
     };

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintsUtil.java

@@ -123,6 +123,12 @@ public class ConstraintsUtil {
                 interestingMethods.add(method);
             }
         }
+        Collections.sort(interestingMethods, new Comparator<Method>() {
+            @Override
+            public int compare(@NotNull Method method1, @NotNull Method method2) {
+                return method1.getName().compareTo(method2.getName());
+            }
+        });
         for (Iterator<Method> iterator = interestingMethods.iterator(); iterator.hasNext(); ) {
             Method method = iterator.next();
             try {