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On 25 November 2010 07:51, Duncan Sands <baldrick at free.fr> wrote: > If you got to XYZ because an instruction threw an exception before %x was > defined, then in XYZ you are using %x which was never defined.  In effect > the definition of %x in bb does not dominate the use in XYZ.  I think the > solution is to say that in XYZ you are not allowed to use any values defined >