[Haskell-cafe] What does "mkUsageInfo: internal name?" mean? (ghc 6.10.1, Template Haskell)

[Serguey Zefirov]

I get a bunch of messages like "mkUsageInfo: internal name?
WritebackCmd{tc a1eZY}" while transforming my program using Template
Haskell.

It displayed for every data type and for every constructor - I
generate some instances for my data types.