Add tests of null-aware constructs in void contexts.

Add tests of null-aware constructs in void contexts.

Fasta desugares some expressions differently in void contexts, so to
be on the safe side, we should test that null-aware invocations and
property accesses work in both void and non-void contexts.

R=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/e981c6fdbca496dc82b848b419b4595309491dd5

[Paul Berry, 2017-06-20 19:19:51]

paulberry@google.com changed reviewers:
+ sigmund@google.com

[Siggi Cherem (dart-lang), 2017-06-20 19:41:25]

lgtm

[Paul Berry, 2017-06-20 22:12:07]

Description was changed from

==========
Add tests of null-aware constructs in void contexts.

Fasta desugares some expressions differently in void contexts, so to
be on the safe side, we should test that null-aware invocations and
property accesses work in both void and non-void contexts.
==========

to

==========
Add tests of null-aware constructs in void contexts.

Fasta desugares some expressions differently in void contexts, so to
be on the safe side, we should test that null-aware invocations and
property accesses work in both void and non-void contexts.

R=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/e981c6fdbca496dc82b848b419b4595309491dd5
==========

[Paul Berry, 2017-06-20 22:12:08]

Committed patchset #1 (id:1) manually as
e981c6fdbca496dc82b848b419b4595309491dd5 (presubmit successful).