fix(experimental): Replace most remaining match panics with errors #7536
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Description
Problem*
Resolves
Summary*
Replaces most remaining panic/println cases in the match compiler with friendly user errors.
The only two remaining errors are what I consider to be the meatier ones: redundant cases & unhandled cases since these require more analysis of the match tree itself. The later also typically requires constructing an example of a value that wouldn't be matched as part of the error message.
Additional Context
I've moved the frontend tests which deal with enums & matches to a new
tests/enums.rs
file since the frontend tests file is quite large. I'll add a comment noting where the new tests in this file are - the old ones are unchanged.Documentation*
Check one:
PR Checklist*
cargo fmt
on default settings.