#2054: :history doesn't
------------------------+---------------------------------------------------
Reporter: igloo | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: GHCi | Version: 6.8.2
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
------------------------+---------------------------------------------------
With this `q.hs`:
{{{
main :: IO ()
main = error "foo"
}}}
if I `:trace main` then `:history` works:
{{{
$ ghci -v0 -fbreak-on-exception q.hs
*Main> :trace main
Stopped at <exception thrown>
_exception :: e = GHC.IOBase.ErrorCall ('f' : _)
[<exception thrown>] *Main> :history
-1 : main (q.hs:3:7-17)
<end of history>
[<exception thrown>] *Main> :q
}}}
but if I first do just `main` first then it doesn't work:
{{{
$ ghci -v0 -fbreak-on-exception q.hs
*Main> main
Stopped at <exception thrown>
_exception :: e = GHC.IOBase.ErrorCall ('f' : _)
[<exception thrown>] *Main> :history
Empty history. Perhaps you forgot to use :trace?
[<exception thrown>] *Main> :trace main
Stopped at <exception thrown>
_exception :: e = GHC.IOBase.ErrorCall ('f' : _)
... [<exception thrown>] *Main> :history
Empty history. Perhaps you forgot to use :trace?
... [<exception thrown>] *Main>
}}}
I assume that this isn't intentional, but confusion in which direction the
history stack grows or something.
This happens in 6.8.2, 6.8 branch and HEAD.
The code in this patch:
{{{
Fri Jan 18 22:56:55 GMT 2008 Ian Lynagh <[EMAIL PROTECTED]>
* Improve the error when :list can't find any code to show
}}}
duplicates the problem when deciding whether or not to tell the user to
rerun with `:trace`.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2054>
GHC <http://www.haskell.org/ghc/>
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