I have a haskell project which I compile with -Werror
by default. This means that when I run cabal repl
it runs with the option -Werror
turned on. This means that for example when I evaluate 2 + 2
I get the following error message:
<interactive>:2:3: Warning:
Defaulting the following constraint(s) to type `Integer'
(Num a0) arising from a use of `+'
In the expression: 2 + 2
In an equation for `it': it = 2 + 2
So I need a way to turn on the option, -w
or maybe -Wwarn
on by default for cabal repl
. How do I do this? Also what are the default flags for ghci
?
You can set GHCi options in your ~/.ghci
file:
:set -w
This overrides the -Wall
from cabal repl
for me.
My understanding is that ghci
has the same defaults a ghc
: it's like calling the compiler with no flags. cabal repl
gets its defaults from your .cabal
file (like ghc-options: -Wall
), but this is overridden by your ~/.ghci
file.
You can also create a .ghci
file in your project directory, with per-project settings there. However, this seems to interact awkwardly with my global ~/.ghci
file: adding a set -Wall
does not override the :set -w
from the global one. I'm not sure if this behavior is intended or I'm just misunderstanding something.
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