evazion 0be0395776 BURs: fix validation of multi-step BURs. ...

Bug: When validating a BUR, we didn't properly simulate running each
line of the BUR in order, which could cause validation to incorrectly
fail in multi-line BURs where some lines depended on previous lines.

This bug meant you couldn't reverse an alias in a single BUR. The old
alias wasn't removed before validating the new alias, so the BUR would
fail with an alias conflict.

This bug also meant that BURs containing duplicate aliases or
redundant implications weren't caught.

The fix is for BUR validation to actually simulate creating and removing
aliases in sequential order, just as they would be when the BUR is
approved. This is done by running the BUR in a transaction, then
rolling back the transaction at the end. This is hacky but it works.

2020-12-01 18:58:45 -06:00

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