Yes you can define your own Prelude. You can’t shadow modules but you can depend on a package providing a custom prelude while not explicitly depending on base.
On Mon 14 Mar 2016 at 14:01 Clinton Mead
<
mailto:Clinton Mead
wrote:
Just thinking out loud here, but could one write their own Prelude which just imports hiding (head), adds a new definition of head, and reexports the lot. Then add this new Prelude higher in the search path perhaps? On Monday, 14 March 2016, Han Joosten < mailto:han.joosten.han@gmail.com
wrote:
Thanks all! Plenty good options, fortunately I found my bug pretty fast by simple code inspection :)) _______________________________________________ Haskell-Cafe mailing list mailto:Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe 2016-03-12 4:28 GMT+01:00 Chris Wong < javascript:_e(%7B%7D,'cvml','lambda.fairy@gmail.com');
: On Sat, Mar 12, 2016 at 8:07 AM, Jonas Scholl < javascript:_e(%7B%7D,'cvml','anselm.scholl@tu-harburg.de');
wrote:
You mean like this?
default-extensions: CPP
cpp-options:
-Dhead=(foldr(const)(error("head:\x20\x65mpty\x20list\x20in\x20"++__FILE__++":"++show(__LINE__))).(take$1))
That's pretty cool! By the way: can the (take$1) be removed? foldr should be lazy enough already. -- Chris Wong ( https://lambda.xyz ) "I had not the vaguest idea what this meant and when I could not remember the words, my tutor threw the book at my head, which did not stimulate my intellect in any way." -- Bertrand Russell _______________________________________________ Haskell-Cafe mailing list javascript:_e(%7B%7D,'cvml','Haskell-Cafe@haskell.org'); http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe