[Haskell-cafe] PatternSignatures (rant)

Johannes Waldmann waldmann at imn.htwk-leipzig.de
Wed Apr 8 03:13:07 EDT 2009

Dear all, (this is a rant - please ignore)

why has "PatternSignatures"
been renamed to "ScopedTypeVariables" (in ghc-6.10)?

show me the alleged "type variable" in this code:
do x :: Int <- [ 1 .. 10 ] ; return $ x^2

and why on earth do I need to use a language extension at all
to get to the most basic thing of declarative programming:
to declare the type of an identifier?

This seriously hurts (me, at least) when teaching Haskell.

Thanks - J.W.

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