GHC 7.10.1 segfaults when shiftL-ing Integers by negative amounts

For numbers other than 1, anyway.

$ ghc -e 'Data.Bits.shiftL 1 (-1)'
-9223372036854775808
$ ghc -e 'Data.Bits.shiftL 2 (-1)'
zsh: segmentation fault  ghc -e 'Data.Bits.shiftL 2 (-1)'
$ ghc -e 'Data.Bits.shiftL 100 (-1)'
zsh: segmentation fault  ghc -e 'Data.Bits.shiftL 100 (-1)'

This also happens with a compiled program. It doesn't with shiftR in either case though.

Side notes:

• On OS X, when the first operand is also negative, I get a bus error instead of a segmentation fault. Linux gives segmentation fault on both.
• On Linux, you have to use ghci instead of -e, for some (probably unrelated?) reason).

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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