I typed "nn" instead of "n", and Darcs crashed.  

Simon

bash-3.1$ darcs record
hunk ./tests/ghc-regress/gadt/gadt8.hs 11
-   EBool   :: Bool                                -> Expr Bool ;
-   EIf     :: (Expr Bool) -> (Expr a) -> (Expr a) -> Expr a    ;
+--   EBool   :: Bool                                -> Expr Bool ;
+--   EIf     :: (Expr Bool) -> (Expr a) -> (Expr a) -> Expr a    ;
Shall I record this change? (1/?)  [ynWsfqadjkc], or ? for help: nn
darcs: <stdin>: hSetBuffering: unsupported operation (Illegal seek)

bash-3.1$ darcs --version
1.0.7 (release)
bash-3.1$

This looks like the same bug as issue41.

Please see the patch in issue41.

For info, this is the patch in question (darcs 1.0.9):

Fri Nov 17 23:14:24 CET 2006  Tommy Pettersson <ptp@lysator.liu.se>
  * ignore failure from hSetBuffering

Marking as resolved; please re-open if you object.