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bug#59814: 28.2; `rx-let` bindings are not visible to `pcase` `rx` forms


From: Daniel Pittman
Subject: bug#59814: 28.2; `rx-let` bindings are not visible to `pcase` `rx` forms
Date: Sun, 4 Dec 2022 12:03:43 +0100

Local rx bindings through the `rx-let` form are not visible to rx
expressions during `pcase` expansion:

(rx-let ((bug "demo")) (rx bug))
=> "demo"

(pcase "demo" ((rx "demo") t))
=> t

(rx-let ((bug "demo")) (pcase "demo" ((rx bug) t)))
=> (error "Unknown rx symbol ‘bug’")
=> ;; expected: t

It looks like `rx--pcase-macroexpander` isn't correctly passing the
:rx-local binding out of the macroexpansion environment into the
translation functions, or something like that.

In GNU Emacs 28.2 (build 2, x86_64-w64-mingw32)
 of 2022-09-13 built on AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.22000
System Description: Microsoft Windows 10 Pro (v10.0.2009.22000.1219)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation
 --without-compress-install CFLAGS=-O2'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
XPM ZLIB

Important settings:
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Major mode: ELisp/l

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