I see, thanks.

It seems that there is an ambiguity here. Binary dependency might mean a
dependency in a binary package as defined in the source package's
control file, or it might mean a dependency in a binary package as
defined in a binary package's control file only.

It seems that check_mir is using the former and calling parse_depends,
and python-apt requires parse_src_depends in this case. The only
documentation I see in python-apt doesn't appear to actually describe
where the name "src" comes from. The confusion seems to be that "src"
might mean that we're parsing a source package's control file (the
assumption that python-apt makes), or that we're parsing the source
package's build-depends in the source package's control file (the
assumption that check-mir makes).

It looks like the spec difference between parse_src_depends and depends
is just that parse_src_depends resolves all arch-specific dependencies
based on the value of APT::Architecture, so I think this can just be
swapped out wholesale without causing any issues.

check-mir still won't be perfect, but at least it'll give _an_ answer
valid for one architecture, rather than crashing with no answer at all
for packages that use this feature.

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https://bugs.launchpad.net/bugs/1149679

Title:
  [check-mir] cannot parse dependencies with architecture restrictions

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