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revset: predicate to avoid lookup errors...
revset: predicate to avoid lookup errors A query like head() and (descendants("bad") and not descendants("fix")) (testing if repo heads are affected by a bug) will abort with a RepoLookupError if either badrev or fixrev aren't found inside the repository, which is not very informative. The new predicate returns an empty set for lookup errors, so head() and (descendants(present("bad")) and not descendants(present("fix"))) will behave as wanted even if those revisions are not found.
Dan Villiom Podlaski Christiansen - - Load All Authors

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multirevs.txt
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When Mercurial accepts more than one revision, they may be specified
individually, or provided as a topologically continuous range,
separated by the ":" character.
The syntax of range notation is [BEGIN]:[END], where BEGIN and END are
revision identifiers. Both BEGIN and END are optional. If BEGIN is not
specified, it defaults to revision number 0. If END is not specified,
it defaults to the tip. The range ":" thus means "all revisions".
If BEGIN is greater than END, revisions are treated in reverse order.
A range acts as a closed interval. This means that a range of 3:5
gives 3, 4 and 5. Similarly, a range of 9:6 gives 9, 8, 7, and 6.