rm-hull / jasengo / 19392075021

Pull #1

github

test: Restore and fix backtracking tests

Restores several previously commented out tests related to
backtracking behavior (`Attempt` and `Choice` interactions).

The package declaration was changed from `parser_test` to
`parser` to run these tests as part of the main package.

165 of 229 new or added lines in 6 files covered. (72.05%)

165 of 229 relevant lines covered (72.05%)

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