Don't wait unnecessarily.

tests/stub-generator/stub-generator.status

Index: tests/stub-generator/stub-generator.status
===================================================================
--- tests/stub-generator/stub-generator.status	(revision 1134)
+++ tests/stub-generator/stub-generator.status	(working copy)
@@ -2,13 +2,17 @@
 # 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.
 
+# IF YOU ARE TEMPTED TO SKIP TESTS HERE, READ THIS FIRST:
+# So far, every time these have been marked skip it is because someone broke
+# the stub generator, usually by making "no such type" unconditionally fatal.
+# Please instead fix the stub generator. Or at least talk to benl before
+# committing your change.
+
 prefix stub-generator
 
 [ $component == vm ]
 
 [ $component == dartc ]
-MintMakerPromiseWithStubsTest : Skip    # Bug 5365165
-MintMakerFullyIsolatedTest : Skip       # Bug 5365165
 
 [ $arch == x64 ]
 *: Skip