commit | 7d7d85ffa2618de166861fbd0c91d2e850ede5fc | [log] [tgz] |
---|---|---|
author | Paul Berry <paulberry@google.com> | Sat Feb 16 13:35:48 2019 +0000 |
committer | commit-bot@chromium.org <commit-bot@chromium.org> | Sat Feb 16 13:35:48 2019 +0000 |
tree | 4de6af47099b6d2f06ecd82c606d6a9a4d015cba | |
parent | fa8c552fd9b9bcb752f7fccf511d58669911b148 [diff] |
Change the default assumption for named parameters to "assume nullable". If a named parameter has no default value, the default behavior is now to assume that the parameter is meant to be nullable, even if no code path can be found that passes null. This was inspired by discussion with Matan and Ferhat--they were concerned that users would see the migration tool changing parameters to required that shouldn't actually be required, and react by adding special sentinel default values. This is not what we want to encourage users to do; if the parameter is truly meant to be optional, it is sensible for it to be nullable. I will soon add logic that allows non-null intent to override this behavior; this means that if the user asserts that the parameter is non-null, or uses the parameter in such a way that a null value would guaranteed to cause an exception, we'll take that as an indication that they really mean for it to be required. Change-Id: Iff388d0316b922d2bacae330d94bec65478d8ee0 Reviewed-on: https://dart-review.googlesource.com/c/93366 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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