tree bb434fa8730bb6d95eb6db4f7c635af7af2cad35
parent 4c9b53fafe1c0a0ce791efdd43ce3e01ece5809b
author Paul Berry <paulberry@google.com> 1536092393 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1536092393 +0000

Avoid a "missing_return" warning in isValidImplementation.

The analyzer can't tell that `unhandled` is guaranteed not to return,
so it thinks that `isValidImplementation` might exit without returning
a value.  An easy workaround is to turn the call to `unhandled` into a
`throw`.

This is needed to roll kernel into the internal Google codebase, in
which the "missing_return" warning causes build failures.

Change-Id: Ia88b6cdef3693ab4646470616c7f868c5bad0502
Reviewed-on: https://dart-review.googlesource.com/72900
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Kevin Millikin <kmillikin@google.com>