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The syntax is slightly different from Mercurial. In Mercurial, a pattern must be quoted like "<kind>:<needle>". In JJ, <kind> is a separate parsing node, and it must not appear in a quoted string. This allows us to report unknown prefix as an error. There's another subtle behavior difference. In Mercurial, branch(unknown) is an error, whereas our branches(literal:unknown) is resolved to an empty set. I think erroring out doesn't make sense for JJ since branches() by default performs substring matching, so its behavior is more like a filter. The parser abuses DAG range syntax for now. It can be rewritten once we remove the deprecated x:y range syntax. |
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