[isabelle-dev] syntax highlighting of inner comments

[Fabian Immler]

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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