This is feature request, not a bug.
"Assignable(tuple, tuple) should probably implement element-wise assignability
since that's the effective semantics when you return a multi-valued expression or
value,ok expression. It comes up in my refactoring tool, I want to ask: can I assign
this expr (multi-valued) to this Signature.Result()? It would be convenient if it
worked for tuples. Not a big deal though."
(personal e-mail from 4/1/2014)
(This may be useful to do, especially if it would simplify checking of return
statements, etc. and cases where the lhs is multi-valued, and the rhs is a (single)
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