Shell: Usability fixes and test #102
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This fixes a grave type inferrence issue, and while technically a breaking change, is not expected to cause trouble (because there is no reason someone would name the returned type directly). Closes: #76
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This primarily fixes #76 by returning an impl trait in a trait (which was not available back around 0.7 when that issue was introduced).
To avoid this kind of regressions in the future, a test is added.