[Haskell-cafe] argument counts...

Neil Mayhew neil_mayhew at users.sourceforge.net
Mon Nov 20 18:16:27 UTC 2017

On 2017-11-20 10:13 AM, Gregory Guthrie wrote:
> But since the interpreter already correctly inferred that the first
> clause has two arguments (with only one explicit), why does it then
> ignore this and give an error when the second clause shows two
> explicit arguments? The types are all correct in either case – why
> require explicit arguments?

Actually, the first clause doesn't have two arguments. It's a
single-argument function that returns a one-argument function. Strictly
speaking, all multi-argument functions are one-argument functions that
return other functions, but the compiler makes a distinction, perhaps to
help guard against mistakes. So it's a requirement that all clauses of a
function definition have the same number of explicit arguments.
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