t7319: Oops! Entered absent arg w_s1Du{v} [lid] [base:GHC.Base.String{tc 36u}]

When compiling t7319 from the test suite with -O2, I get the above error, tested with latest HEAD (20130304). Reporting since this looks weird, and t7319 is not compiled with this option in the suite (it's a test for stack traces, i found it while debugging GHCJS which has its own test suite runner but borrows tests from GHC)

luite@wolfgang:~/buildtest/ghcjs/test/ghc/codeGen$ ghc -O2 -fforce-recomp t7319.hs
[1 of 1] Compiling Main             ( t7319.hs, t7319.o )
Linking t7319 ...
luite@wolfgang:~/buildtest/ghcjs/test/ghc/codeGen$ ./t7319 
t7319: Oops!  Entered absent arg w_s1Du{v} [lid] [base:GHC.Base.String{tc 36u}]

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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