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bug#60974: 30.0.50; byte-compile-preprocess mutates self evaluating form


From: Stefan Monnier
Subject: bug#60974: 30.0.50; byte-compile-preprocess mutates self evaluating forms in expanded macro bodies
Date: Sat, 21 Jan 2023 00:43:31 -0500
User-agent: Gnus/5.13 (Gnus v5.13)

> The attached patch should fix this, thoughts?

It's not really an option:
- it's expensive
- it breaks code when it doesn't form a tree, e.g.

      (list '#1=(a b #1#) 'c 'd)

Instead, we need to find out where in the code we perform the
side effect and change just that part.


        Stefan






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