Provide access to list of types that cannot be subtyped (issue 23125)

Provide access to list of types that cannot be subtyped (issue 23125)

R=paulberry@google.com, vsm@google.com

Committed: https://code.google.com/p/dart/source/detail?r=44972

[Brian Wilkerson, 2015-04-07 20:46:06]

brianwilkerson@google.com changed reviewers:
+ paulberry@google.com, vsm@google.com

[Brian Wilkerson, 2015-04-07 20:46:06]

Suggestions for a better name are welcome.

[vsm, 2015-04-07 20:51:12]

thanks!  lgtm

https://codereview.chromium.org/1069473002/diff/1/pkg/analyzer/lib/src/genera...
File pkg/analyzer/lib/src/generated/resolver.dart (right):

https://codereview.chromium.org/1069473002/diff/1/pkg/analyzer/lib/src/genera...
pkg/analyzer/lib/src/generated/resolver.dart:13273: List<InterfaceType> get
nonSubtypableTypes;
sealedTypes is another option

[Paul Berry, 2015-04-08 16:06:57]

lgtm.  I don't have a strong opinion on the name.

[Brian Wilkerson, 2015-04-08 16:11:12]

Committed patchset #1 (id:1) manually as 44972 (presubmit successful).

[Brian Wilkerson, 2015-04-08 16:13:13]

The only reference I see to "sealed" is C#, but the use there appears to be
related to inheritance rather than subtyping. I'd prefer a more general name,
but I couldn't find one in the literature.