#3302: Where-clause environments for GHCi
-----------------------------+----------------------------------------------
Reporter: cjs | Owner:
Type: feature request | Status: new
Priority: normal | Component: GHCi
Version: 6.10.3 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Often in ghci I'd like to interactively debug and play with functions in
the `where` clause of a top-level definition. Currently, this requires one
to change the code, lifting the definitions in question to the top level
and adding appropriate parameters.
Given a definition such as
{{{
top :: Int -> Int
top x = mult 4 - mult 3 + mult 2
where
mult n = x * n
}}}
it would be nice to type something such as `:environment top 2` to put me
in an envrionment where `mult` is available and `mult 4` will evaluate to
`8`. (Obviously this becomes more useful with more complex definitions.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3302>
GHC <http://www.haskell.org/ghc/>
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