Inconsistent command-line error messages

[davidcok]

Dafny version

4.1.0+dev

Code to produce this issue

No response

Command to run and resulting output

No response

What happened?

The command-line error messages take many forms:

• some start with *** Error:, some with dafny: Error, some with no prefix
• some go to stdout, some to stderr
• some include the full legacy help document, some do not
• some use exceptions for handling errors, some do not
• they generally do not use the same ErrorReporter mechanism that other errors do

Regularizing this is complicated by the design in which the dafny tool uses the boogie command-line parser for part of its logic. It is also complicated by needing to support both verb-form (which uses the .NET Command Line handling library) and legacy CLI.

What type of operating system are you experiencing the problem on?

Mac