Don't export unnamed mixins.

pkg/front_end/testcases/shaker.status

Index: pkg/front_end/testcases/shaker.status
diff --git a/pkg/front_end/testcases/shaker.status b/pkg/front_end/testcases/shaker.status
index f02e7234845ac2b78744192c7b526a07d0ae3346..90073e4002910970fc55103cb9cc511fdb046505 100644
--- a/pkg/front_end/testcases/shaker.status
+++ b/pkg/front_end/testcases/shaker.status
@@ -6,3 +6,4 @@
 # tree-shaking piece of the modular compilation in fasta.
 
 include_field_type: Fail # Fasta does not create interfaceTarget on accessors.
+transitive_mixins: Fail # Don't know how to update expectations.

[Siggi Cherem (dart-lang), 2017/08/28 15:57:54]

not sure I understand the reason in this comment

[ahe, 2017/08/28 18:19:24]

The expectation file
(pkg/front_end/testcases/shaker/transitive_mixins.dart.shaker) says:

DO NOT EDIT -- this file is autogenerated ---

What am I supposed to edit instead?

[Siggi Cherem (dart-lang), 2017/08/28 19:43:29]

Thank you, we can make the .shaker file self document how to regenerate it.

You can do it in a similar way as with the other tests via:

  ./pkg/front_end/tool/fasta testing -DupdateExpectations=true
shaker/transitive_mixins

[ahe, 2017/08/29 09:15:24]

So in other words, I'm actually supposed to edit
pkg/front_end/testcases/shaker/transitive_mixins.dart.shaker if the expectations
changes?

[Siggi Cherem (dart-lang), 2017/08/29 15:43:10]

correct - would it help if we change the extension from .shaker to
.shaker.expect ?

It's just like the expected golden files you have for kernel code, except that
the contents are tailored to the shaker

[ahe, 2017/08/29 16:24:57]

That would help. And also if the file didn't say "do not edit" :-)