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  • Glasgow Haskell Compiler
  • GHCGHC
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  • #13835
Closed
Open
Created Jun 16, 2017 by waldmann@imn.htwk-leipzig.de@trac-waldmann

ghci with ":set +t" should print type before starting evaluation

Not an actual bug, but questionable design perhaps.

I think this is backwards, as static analysis comes before evaluation, not after:

Prelude> :set +t
Prelude> reverse [True]
[True]
it :: [Bool]

When evaluation raises an exception, no type is printed.

Prelude> :set +t
Prelude> True && undefined
*** Exception: Prelude.undefined
CallStack (from HasCallStack):
  error, called at libraries/base/GHC/Err.hs:79:14 in base:GHC.Err
  undefined, called at <interactive>:8:9 in interactive:Ghci4

For teaching (and for my own sanity) I'd much prefer output in logical succession.

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Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component GHCi
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