Friendlier Error Messsages

[barnjamin]

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Problem

Couple reports in the discord with confusion around including a call like App.localGetEx return var in the seq. The error message is something like:

raise TealInternalError(msg) from errors[0]
pyteal.TealInternalError: Encountered 1 error when assigning slots to subroutine

This error message makes it difficult to figure out the actual cause

Solution

Not sure how it could be improved

Urgency

No urgency

[algoanne]

@barnjamin is this still an issue?

[barnjamin]

Yes but maybe less so after improving the traceback on pyteal generated expressions as in MultiValues