<div dir="ltr">Dunno about safety results, but <a href="https://www.haskell.org/onlinereport/haskell2010/">https://www.haskell.org/onlinereport/haskell2010/</a> exists (next revision expected in 2020 iirc). <a href="https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/lang.html">https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/lang.html</a> documents ghc's extensions to the standard, and <a href="https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/bugs.html#haskell-standards-vs-glasgow-haskell-language-non-compliance">https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/bugs.html#haskell-standards-vs-glasgow-haskell-language-non-compliance</a> its deviations from the standard, some of which will likely be in the next standard.<div><br></div><div>Some things, such as how typeclasses are implemented, are not specified in the standard so that alternative implementations can choose to implement them differently. ghc uses dictionary / record parameters; jhc did whole program compilation, so all non-polymorphically-recursive typeclass methods could be resolved at compile time (I don't know offhand how it handled polymorphic recursion).</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Dec 16, 2017 at 11:43 PM, Todd Wilson <span dir="ltr"><<a href="mailto:twilson@csufresno.edu" target="_blank">twilson@csufresno.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Why doesn't Haskell (or at least "core" Haskell) have a formal definition and safety result the way Standard ML does [1], [2]? Is it just that no one has gotten around to producing them, or because there are fundamental difficulties that stand in the way of completing such a project?<div><br></div><div>Todd Wilson</div><div><br></div><div>[1] Robin Milner, Mads Tofte, Robert Harper, and David MacQueen. The Definition of Standard ML (Revised). MIT Press, 1997.</div><div>[2] Daniel K. Lee , Karl Crary , Robert Harper, "Mechanizing the Metatheory of Standard ML", <a href="http://www.cs.cmu.edu/~dklee/tslf/" target="_blank">http://www.cs.cmu.edu/~<wbr>dklee/tslf/</a></div></div>
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