Re: GHC 6.4 release candidates available [GHCi reloads incorrectly]

11 Feb 2005

      If I have two simple modules, Module1 and Module2 like this;

module Module1 where
f = "hello"

module Module2 where
import Module1

I load up Module2 in GHCi, and I can evaluate f in Module1;

Compiling Module1          ( ./Module1.hs, interpreted )
Compiling Module2          ( Module2.hs, interpreted )
Ok, modules loaded: Module2, Module1.
*Module2> f
"hello"

Now I change Module1 to

module Module1 where
f = "hello2"

and reload; this happens in the GHC 6.4 RC:

*Module2> :r
Compiling Module1          ( ./Module1.hs, interpreted )
Skipping  Module2          ( Module2.hs, interpreted )
Ok, modules loaded: Module2, Module1.
Prelude Module2>

And I can no longer get at anything in Module1 (this is generally true
of any imported modules), only stuff in Module2. Instead I have to do a
full reload. In GHC 6.2, if you did this it reloaded both modules and
everything was fine, so I'm guessing this is incorrect behaviour.

-Si.

-- 
Simon David Foster <s.d.f@btinternet.com>