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bug#55645: src/print.c; print_object changes make it impossible to compa
From: |
Tom Gillespie |
Subject: |
bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions |
Date: |
Fri, 27 May 2022 12:19:27 -0700 |
> but admittedly, these changes are usually for more obscure
> objects than symbols
I was thinking the same. I realize that for many objects where
there is no guarantee of homoiconicity the prin1 representation
definitely changes all the time. However, I think that symbols
fall into a more homoiconic category (namely the category
of objects that can appear literally in code).
Some time between emacs 18 and xemacs/22 the reader
DID change with regard to periods in symbols. In 18 you had
to escape the period or the reader throws a syntax error.
Thus your point about there being a mismatch between read
behavior and prin1 representation is accurate.
That being said, I think this is be the first time in the history
of emacs that prin1 for symbols has changed, so having a
way to preserve the old behavior for things that depend on it
would be greatly appreciated.
> prin1? Stable for 30 years? Nope. (But some objects have had a stable
> printed representation that long, I'm sure.)
Er, indeed, I was being overly general, I meant symbols specifically.
I went back and checked in emacs-18 and this is what I get:
(prin1-to-string '(a b\.c d))
"(a b\\.c d)"
(emacs-version)
"GNU Emacs 18.59.1 of Sat Jul 31 2021 on localhost (linux)"
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Tom Gillespie, 2022/05/25
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Lars Ingebrigtsen, 2022/05/26
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Tom Gillespie, 2022/05/26
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Lars Ingebrigtsen, 2022/05/27
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions,
Tom Gillespie <=
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Lars Ingebrigtsen, 2022/05/28
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Tom Gillespie, 2022/05/28
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Lars Ingebrigtsen, 2022/05/29
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Eli Zaretskii, 2022/05/29
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Tom Gillespie, 2022/05/29
- bug#55645: src/print.c; print_object changes make it impossible to compare elisp code across versions, Richard Stallman, 2022/05/28