[Haskell-cafe] Ambiguous reified dictionaries
Martijn van Steenbergen
martijn at van.steenbergen.nl
Thu Apr 9 04:57:24 EDT 2009
Lennart Augustsson wrote:
> That program is incorrect, it contains two instances for Monoid Int,
> and the compiler should flag it as illegal.
Two simultaneous instances are okay as long as you don't use any of
those instances, right? Just like two imported symbols with the same
name are okay as long as you don't use them.
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