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A comment on Swift – observations from Rust’s original designer. Parent comment

Re:Swift – observations from Rust’s original designer by dbaupp on Tuesday June 03, 2014 @08:30AM (#7839691)
Haskell has it for its type classes in the form of existentials[1] too:

  forall a. SomeClass a => a
in Haskell is quite similar to

  &SomeTrait
in Rust.

[1] http://www.haskell.org/haskellwiki/Existential_type

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