Fix recursive dependencies. Fixes #269.

[sgielen]

• Add a test. Without the fix, it will currently fail.
• Prevent dead loops. Fixes failing test.
• Don't hide thrown exceptions.

[sgielen]

@amio respectful bump :-)

[amio]

@sgielen Sorry for missing this PR, let me take a look~

[amio]

Just merged, thanks! @sgielen