ghci accepts ":set -fno-glasgow-exts", but not ":unset -fglasgow-exts"

[cdsmith@…]

Using "gchi -fglasgow-exts", I want to turn off glasgow extensions. First I try:

Prelude> :unset -fglasgow-exts can't unset GHC command-line flags

But then:

Prelude> :set -fno-glasgow-exts Prelude> :t 5 5 :: (Num t) => t

So GHCi is capable of turning off glasgow extensions, but is apparently really picky about what command is used to do it.

sorear suggested I file this as a bug.

[guest]

That should have been:

Prelude> :unset -fglasgow-exts
can't unset GHC command-line flags 

and

Prelude> :set -fno-glasgow-exts
Prelude> :t 5
5 :: (Num t) => t 

[simonmar]

Fixed (well, I was in the area).