Hi Chris,
I think you're looking for -ddump-ds which outputs the Core just after the
desugarer is done. -ddump-simpl gives the Core after the simplifier is run.
Hope that helps,
Rahul
On Fri, Apr 7, 2017 at 6:25 PM, Christopher Done
Hi all,
Just checking, if I want to see the Haskell code desugared to core BEFORE any simplification passes, is this the way to do it?
bash-3.2$ cat > X.hs module X where it = (\x -> x * 2) 123 bash-3.2$ stack exec -- ghc -ddump-simpl X.hs -fforce-recomp -fmax-simplifier-iterations=0 -O0 [1 of 1] Compiling X ( X.hs, X.o )
==================== Tidy Core ==================== Result size of Tidy Core = {terms: 11, types: 3, coercions: 0}
-- RHS size: {terms: 4, types: 1, coercions: 0} it :: Integer [GblId, Str=DmdType] it = * @ Integer GHC.Num.$fNumInteger 123 2
I was a bit surprised that the lambda is collapsed already with optimizations turned off and the simplifier iterations set to 0. I changed this to (\x -> x * x) and it produced a let instead. Is this just one of the things the HS->Core desugarer decides to do?
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-- Rahul Muttineni