722bd25426
`ManifestNode.encode` relies on being able to iterate over tokens of the AST node. And if the default value of a formal parameter of a `FunctionType` that came from summary does not have tokens linked, this causes an exception. Bug: https://github.com/dart-lang/sdk/issues/62202 Change-Id: I0156dfd935cc9b4fa7ec51b417647f455fa68a61 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/466920 Reviewed-by: Paul Berry <paulberry@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>