It's pretty funny that the Ohloh comparison shows Mercurial to be "Mostly written in Perl"! The same is also shown on the language details for Mercurial.
Turns out that Mercurial uses something similar to shell scripts with a .t extension for test cases, which the language detector categorizes as Perl. Luckily Ohcount, the library which does the counting, is on GitHub, so I submitted a pull request to change that.
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