50dfbe9579
Avoids a compiler crash if invalid characters in the type names leak from the CFE. Change-Id: I3c9a9fcfd2ac6ef4f7ef5593a53d6f936653955e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/162260 Reviewed-by: Mark Zhou <markzipan@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>