ghc panic

[danielhanlon]

Apologies if this is an inappropriate bug report - I'm new to Haskell and haven't figured out how to navigate around the possible errors....

I have now noticed (at least some of) the errors in the following but I get a ghc panic when I load this into ghci:

---rectPolh.hs data Point2D = Cartesian2D Double Double

| Polar2D Double Double deriving (Eq,show)

instance Eq Point2D where

Cartesian2D x y == Polar2D r theta =

x == rx && y == ry

where rx=r * cos theta

ry=r * sin theta

i.e.

GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> :load rectPol.hs [1 of 1] Compiling Main ( rectPol.hs, interpreted ) ghc: panic! (the 'impossible' happened)

(GHC version 7.4.2 for x86_64-apple-darwin):

nameModule show{tv aaH}

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

[danielhanlon]

source file loaded

[simonpj]

Dup of #5961, happily fixed in 7.6