Hi,Up until Isabelle2018, I used (* ... *) to comment out parts of lemmas/definitions, mostly for debugging larger expressions. Highlighted in red, (* ... *) was nicely set apart from the rest of the expression.
Now (e.g., isabelle/b58a575d211e) we can use \<^cancel>, but its "highlighting" in black makes it very hard to keep an overview.
Note that e.g., with a type error in a lemma statement, canceled text is highlighted red (like in the attached screenshot).
Best regards, Fabian
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