[+es-discuss] On 10 May 2013 21:05, Andreas Rossberg <rossberg@google.com> wrote: > On 10 May 2013 14:52, Mark S. Miller <erights@google.com> wrote: >> An upper case type variable, e.g. T, is fully parametric. It may be a >> promise or non-promise. >> A lower case type variable, e.g. t, is constrained to be a non-promise. If >> you wish to think in conventional type terms, consider Any the top type >> immediately split into Promise and non-promise. Thus type parameter t is >> implicitly constrained to be a subtype of non-promise. > > Mark, I'm afraid such a distinction makes absolutely no sense in a > world of structural types. How would you specify the set of "types > that aren't promises" in a way that is compatible with structural > subtyping? > > /AndreasReceived on Friday, 10 May 2013 19:40:15 UTC
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