Fix eager macro-expansion failure during startup

Emacs attempts to expand macros when loading uncompiled files to speed
up their execution.  Since rx is not loaded during startup, Emacs is
not aware of the rx pattern for pcase, and takes it for the rx macro.

Since this macro does not understand (let …) forms, it throws an
"unknown rx pattern" error, which interrupts macro-expansion and shows
a noisy warning.

0 files changed, 0 insertions, 0 deletions