Phyx <loneti...@gmail.com> writes: >> I highly doubt that this split will have any measurable overhead. >> Reexporting a definition defined in one module from another module via >> an export list does not produce any code at all; importing such a >> declaration is equivalent to importing the definition from the defining >> module. > > Ah right, I can see how that's true at the Haskell level but.. > >> If for some reason we can't in some cases directly reexport then we >> would likely rather have a some very trivial bindings that GHC would be >> quite eager to inline. > > Sure, I can see how you'd inline based on the haskell contract, I can't see > how you avoid the compile time overhead when compiling the library. If you > have a haskell library > > module Test (Control.Monad.when, Control.Applicative.many) where > > import Control.Monad(when) > import Control.Applicative(many) > > compiling it: > > ghc test.hs > [1 of 1] Compiling Test ( test.hs, test.o ) > To clarify, what is happening in this program is not inlining. Rather when you re-export `Control.Monad.when` from `Test` GHC merely records this fact in the interface file it produces for `Test`. No code is generated for `when` in `Test`.
Cheers, - Ben
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