diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index 387a6ab4afc..664aee520ae 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -629,7 +629,7 @@ abstract class Compiler implements DiagnosticListener {
     if (libraryName == 'dart:isolate'
         || libraryName == 'dart:html'
         // TODO(floitsch): create a separate async-helper library instead of
-        // importing the isolate-library just for async.
+        // importing the isolate-library just for TimerImpl.
         || libraryName == 'dart:async') {
       importIsolateHelperLibrary(library);
     }
diff --git a/tests/compiler/dart2js/pretty_parameter_test.dart b/tests/compiler/dart2js/pretty_parameter_test.dart
index 6831370643b..6bd0bddcde0 100644
--- a/tests/compiler/dart2js/pretty_parameter_test.dart
+++ b/tests/compiler/dart2js/pretty_parameter_test.dart
@@ -101,7 +101,7 @@ main() {
   regexp = new RegExp(r"a = 2;");
   Iterator matches = regexp.allMatches(generated).iterator;
   Expect.isTrue(matches.moveNext());
-  Expect.isFalse(matches.moveNext);
+  Expect.isFalse(matches.moveNext());
 
   generated = compile(PARAMETER_INIT, entry: 'foo');
   regexp = new RegExp("var result = start;");
diff --git a/tests/language/double_to_string_as_exponential2_test.dart b/tests/language/double_to_string_as_exponential2_test.dart
index d9fa1a1abd4..9c085a463b4 100644
--- a/tests/language/double_to_string_as_exponential2_test.dart
+++ b/tests/language/double_to_string_as_exponential2_test.dart
@@ -4,7 +4,6 @@
 // Test basic integer operations.
 
 main() {
-  // TODO(floitsch): verify that returned exception is correct type.
   Expect.throws(() => (1.0).toStringAsExponential(-1),
                 (e) => e is RangeError);
   Expect.throws(() => (1.0).toStringAsExponential(21),