#2982: GHCi crashes if a :def command gets a pattern-match error
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Peter Hercek reports
{{{
% ghci
GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> :def err (\_->return $ concat $ replicate (read "\"1\"") "a")
Prelude> :err
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-unknown-linux):
Prelude.read: no parse
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
The "no parse" is quite correct: `(read "\"1\"") :: Int` should fail to
parse. But it's wrong that a crashing `:def` should crash out of GHCi.
Rather it should just return to the prompt, preferably with a failure
message saying that running a `:def` failed.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2982>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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