invariant cleanup

pkg/compiler/lib/src/diagnostics/invariant.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.diagnostics.invariant;
 
 import 'spannable.dart';
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
 const bool REPORT_EXCESS_RESOLUTION = false;
 
 /// Flag that can be used in assertions to assert that a code path is only
 /// executed as part of development.
 ///
 /// This flag is automatically set to true if helper methods like, [debugPrint],
 /// [debugWrapPrint], [trace], and [reportHere] are called.
 bool DEBUG_MODE = false;
 
 /// Assert that [DEBUG_MODE] is `true` and provide [message] as part of the
 /// error message.
 assertDebugMode(String message) {
   assert(DEBUG_MODE,
       failedAt(NO_LOCATION_SPANNABLE, 'Debug mode is not enabled: $message'));
 }
 
-/**
- * Throws a [SpannableAssertionFailure] if [condition] is
- * [:false:]. [condition] must be either a [:bool:] or a no-arg
- * function returning a [:bool:].
- *
- * Use this method to provide better information for assertion by calling
- * [invariant] as the argument to an [:assert:] statement:
- *
- *     assert(invariant(position, isValid));
- *
- * [spannable] must be non-null and will be used to provide positional
- * information in the generated error message.
- */
-bool invariant(Spannable spannable, var condition, {var message: null}) {
-  // TODO(johnniwinther): Use [spannable] and [message] to provide better
-  // information on assertion errors.
-  if (spannable == null) {
-    throw new SpannableAssertionFailure(CURRENT_ELEMENT_SPANNABLE,
-        'Spannable was null for invariant. Use CURRENT_ELEMENT_SPANNABLE.');
-  }
-  if (condition is Function) {
-    condition = condition();
-    if (condition is String) {
-      message = condition;
-      condition = false;
-    }
-  }
-  if (!condition) {
-    if (message is Function) {
-      message = message();
-    }
-    throw new SpannableAssertionFailure(spannable, message);
-  }
-  return true;
-}
-
 /// Throws a [SpannableAssertionFailure].
 ///
 /// Use this method to provide better information for assertion by calling
 /// [failedAt] as the second argument to an `assert` statement:
 ///
 ///     assert(condition, failedAt(position, message));
 ///
 /// [spannable] must be non-null and will be used to provide positional
 /// information in the generated error message.
 bool failedAt(Spannable spannable, [var message]) {
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (spannable == null) {
     throw new SpannableAssertionFailure(
         CURRENT_ELEMENT_SPANNABLE,
         'Spannable was null for failedInvariant. '
         'Use CURRENT_ELEMENT_SPANNABLE.');
   }
   if (message is Function) {
     message = message();
   }
   throw new SpannableAssertionFailure(spannable, message);
 }
-
-typedef void InternalErrorFunction(Spannable location, String message);