process created by system "yes" exits with error code 1

[greenrd]

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> :m +System.Process
Prelude System.Process> system "yes"

results in a long stream of "y"s and then, almost instantly:

ExitFailure 1

This should not happen. The Linux command "yes" is supposed to run forever, and exit code 1 indicates a write error.

[greenrd]

This bug does not occur when ghc -e is used instead of ghci.

[simonmar]

Turns out to be the same bug as #2778.