g-w1 153c97ac9e improve stage2 to allow catch at comptime:
* add error_union value tag.
* add analyzeIsErr
* add Value.isError
* add TZIR wrap_errunion_payload and wrap_errunion_err for
  wrapping from T -> E!T and E -> E!T
* add anlyzeInstUnwrapErrCode and analyzeInstUnwrapErr
* add analyzeInstEnsureErrPayloadVoid:
* add wrapErrorUnion
* add comptime error comparison for tests
* tests!
2021-02-25 16:41:16 -08:00
..
2020-10-31 12:21:49 +02:00