Error signal.  3   "Error, but then press Proceed ----> 3"

[Error signal] on: Error do: [ : err | err resume: 3 ]
"IllegalResumeAttempt, but then press Proceed -----> 3"

This is not a regression from 4.5, but something to be aware of when
using the debugger, because Error signalers assume the code that
follows will not be run.