Error Handling

[rmhsilva]

Currently, errors in Python/Teal cause everything to halt and fail - you have to restart the program.

Teal needs a condition signalling/exception handling mechanism.

This has two parts

• the machine instructions (register condition handler, signal condition)
• the teal special forms to declare handlers/restarts, and signal conditions.

[rmhsilva]

Preliminary thoughts

• "boxed error" return types (like Rust, Haskell, others). Requires syntax and support for "proper" types.
• condition handlers (exceptions, or generic "signals" as in Common Lisp / R). Fairly easy to implement here.