Repeated 'fnty' in curried function types

[gribozavr]

According to the grammar in the basic syntax proposal (#162) it seems like curried function types require repeating the fnty keyword:

expression:  "fnty" tuple return_type
return_type:  "->" expression

For example:

fnty (Int) -> Int // OK
fnty (Int) -> fnty (Int) -> Int // repeated fnty
fnty (Int) -> (Int) -> Int // desired

I understand why it happens, and I see that it is uniform with regards to the expression production, but the result -- repeated fnty keywords -- does not seem aesthetically pleasing to me.

[jonmeow]

Note, "Should there be a function type? #191" may supersede this issue.

[jsiek]

This issue with repeated fnty a good observation. Certainly a disadvantage of the current syntax.

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