bug#52801: Guile inconsistently misbehaves in case of escapes and carriage returns, breaking "guix pull"

[Maxime Devos]

retitle 52801 Guile inconsistently misbehaves in case of escapes and carriage 
returns, breaking "guix pull"
severity 52801 important
thanks

Grigory Shepelev schreef op zo 26-12-2021 om 13:14 [+0300]:
Today's guix pull gives the following bug.

Seems like an instance of <https://issues.guix.gnu.org/52559#15>.
I took the liberty of renaming the bug report appropriately.

Anyway, here's the minimal reproducer:

Run the following in a REPL:
(call-with-input-string "\"Hello\\\rcarriage return!\"" read)
;; --> invalid character in escape sequence: #\return

Greetings,
Maxime.