[rust-dev] RFC: "impl Trait for Type"

Niko Matsakis niko at alum.mit.edu
Mon Dec 31 14:18:46 PST 2012

I think of it was "implementing a type" (that is, defining the methods 
that are intrinsic to a type) vs "implementing a trait".  It feels 
pretty natural to me to think of it that way.


Patrick Walton wrote:
> On 12/31/12 3:05 AM, Gareth Smith wrote:
>> Because they both start with the same keyword. Though perhaps this is
>> not significant.
> Agreed, I considered this. There are a couple of reasons why I didn't 
> propose a different keyword:
> 1. Rust tries hard to reuse keywords in general, since everyone likes 
> a small set of keywords.
> 2. I didn't really like any of the obvious options. The most obvious 
> keyword to switch to would be "inst" to mirror Haskell and so forth, 
> but is "impl"/"inst" really less confusing? I suspect many programmers 
> would want to "implement" a trait and would choose "impl".
> Patrick
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