ghc panic building text 0.11.1.5 with 7.2.1 from debian/experimental

This happened in a clean build environment:

[24 of 38] Compiling Data.Text        ( Data/Text.hs, dist-ghc/build/Data/Text.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.2.0.20110728 for x86_64-unknown-linux):
	cgLookupPanic (probably invalid Core; try -dcore-lint)
    $w$j{v s1HTU} [lid]
    static binds for:
    local binds for:

Trac metadata

Trac field	Value
Version	7.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture