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@end lisp
@end deftp
+For Mercurial repositories, the module @code{(guix hg-download)} defines
+the @code{hg-fetch} origin method and @code{hg-reference} data type for
+support of the Mercurial version control system.
+
+@deffn {Scheme Procedure} hg-fetch @var{ref} @var{hash-algo} @var{hash} @
+ [name]
+Return a fixed-output derivation that fetches @var{ref}, a
+@code{<hg-reference>} object. The output is expected to have recursive
+hash @var{hash} of type @var{hash-algo} (a symbol). Use @var{name} as
+the file name, or a generic name if @code{#false}.
+@end deffn
+
@node Defining Package Variants
@section Defining Package Variants