Dear all,

To avoid that this issue, encountered by Lars, gets lost, I'll re-raise it here:

The following lemma statement raises an obscure internal TYPE exception:

lemma
  assumes "P foo" (is "P ?bar")
  shows "Q ?bar"

I assume that is-bindings cannot be used in the same structured statement. I also assume that this would be hard to support in general.

Is there any chance of getting a decent error message here, since it is actually quite natural to attempt something like this.

Alex
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