#1896: Keep old bindings until :load succeeds
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Reporter: tibbe | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: GHCi | Version:
Severity: normal | Keywords:
Testcase: | Architecture: Multiple
Os: Multiple |
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Imagine you make a change to a module which is already loaded into GHCi
and then try to {{{:load}}} it again. If the load fails not only will you
not have the new bindings but the old ones are lost as well. This prevents
you from e.g. using {{{:type}}} to figure out why your new change doesn't
type check.
A more ambitious solution would be to try to incrementally load the module
and keep all bindings up to the one that fails (and its dependents.) This
would allow you to debug the failure more interactively (e.g. compose
functions and look at their combined types.) This is probably trickier as
previous bindings might be invalidated.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1896>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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