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Featherweight Go
Preprint
Robert Griesemer ,
Raymond Hu ,
Wen Kokke ,
Julien Lange ,
Ian Lance Taylor ,
Bernardo Toninho ,
Philip Wadler ,
Nobuko Yoshida
24 May 2020
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Abstract
We describe a design for generics in Go inspired by previous work on Featherweight Java by Igarashi, Pierce, and Wadler. Whereas subtyping in Java is nominal, in Go it is structural, and whereas generics in Java are defined via erasure, in Go we use monomorphisation. Although monomorphisation is widely used, we are one of the first to formalise it. Our design also supports a solution to The Expression Problem.