don't return uninitialized memory from bdiff.blocks() bdiff.blocks() returns a dummy match at the end of both files; the length of that chunk is never set, so it will sometimes contain random heap garbage. There are apparently workarounds for this elsewhere: # bdiff sometimes gives huge matches past eof, this check eats them,

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adding changesets
killed!
transaction abort!
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.hg/00changelog.i .hg/journal.dirstate .hg/requires .hg/store .hg/store/00changelog.i