GHCi and line numbers (with ghc-7.4.1)
sol at typeful.net
Thu Mar 22 14:16:46 CET 2012
> >ghc --interactive now behaves different in regards to line numbers in
> >error messages than previous versions.
> >They are now incremented with each evaluated expression.
> > $ ghc --interactive -ignore-dot-ghci
> > Prelude> foo
> > <interactive>:2:1: Not in scope: `foo'
> > Prelude> bar
> > <interactive>:3:1: Not in scope: `bar'
> >Is there a way to disable this (or alternatively reset the counter for a
> >running session)?
> Sorry, there's no way to reset it at the moment. What do you need that for?
I use ghci for doctest  to evaluate examples. All examples within
one Haddock comment are grouped to a /session/. And I reuse the same
ghci process to run several sessions. Before a new session is run, I
try (as far as possible) to reset ghci into a pristine state. The
counter for line numbers is just one more thing that is carried over.
A contrived example where this makes a difference is at .
I think this is not critical. But putting doctest aside, I still
preferred the old behavior.
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