hSetBuffering NoBuffering and getChar don't work properly on Windows

With this program:

import System.IO

main = do { hSetBuffering stdin NoBuffering; run }
run = do { getChar; putStrLn "yes"; run }

if I type

abc<enter>def<enter><control-C>

then:

On Linux and OS X I get the desired output:

$ ./q
ayes
byes
cyes

yes
dyes
eyes
fyes

yes
^Cq: interrupted

In an MSYS window I get:

$ ./q
abc
def

In a cygwin window or a cmd windows I get:

$ ./q
abc
yes
yes
yes
yes
def
yes
yes
yes
yes

and the program doesn't die.

SSHing into cygwin I get:

$ ./q
abc
def

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture	Unknown