GHCi is setting stdin/stdout to NoBuffering in runghc when DYNAMIC_GHC_PROGRAMS=YES

=====> 2228(normal) 6 of 8 [0, 0, 0]
cd . && $MAKE --no-print-directory -s 2228    </dev/null >2228.run.stdout 2>2228.run.stderr
Actual stdout output differs from expected:
--- ./2228.stdout       2011-07-21 12:03:54.000000000 +0100
+++ ./2228.run.stdout   2012-10-05 02:07:04.000000000 +0100
@@ -1,2 +1,2 @@
 BlockBuffering Nothing
-BlockBuffering Nothing
+NoBuffering
*** unexpected failure for 2228(normal)

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
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Related
Blocking
CC
Operating system
Architecture