Unexpcted failure, ambiguous type variable defaulted (ghci)

[daniel.is.fischer]

=====> print019(ghci) 1444 of 2601 [0, 0, 0]
cd ./ghci.debugger/scripts && HC='/home/dafis/Haskell/Hacking/newghc/inplace/bin/ghc-stage2' HC_OPTS='-dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts -optl-lz ' '/home/dafis/Haskell/Hacking/newghc/inplace/bin/ghc-stage2' --interactive -v0 -ignore-dot-ghci -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts -optl-lz  -ignore-dot-ghci   <print019.script >print019.run.stdout 2>print019.run.stderr
Actual stderr output differs from expected:
--- ./ghci.debugger/scripts/print019.stderr.normalised  2010-10-12 20:42:15.000000000 +0200
+++ ./ghci.debugger/scripts/print019.run.stderr.normalised  2010-10-12 20:42:15.000000000 +0200
@@ -1,7 +0,0 @@
-
-<interactive>:1:1:
-    Ambiguous type variable `t1' in the constraint:
-      (Show t1) arising from a use of `print'
-    Cannot resolve unknown runtime types: t1
-    Use :print or :force to determine these types
-    In a stmt of an interactive GHCi command: print it
*** unexpected failure for print019(ghci)

Unexpectedly, the type variable was resolved.

[simonmar]

we must fix this before the next RC.

[daniel.is.fischer]

break001 and break006 joined print019 in failing to fail today. Same reason.

[simonpj]

Fixed