bug#36321: Error: Forgot to expand macro pcase--flip in (pcase--flip memql '(2 1) val)

[Noam Postavsky]

Andreas Schwab <schwab@linux-m68k.org> writes:

> https://build.opensuse.org/package/live_build_log/home:AndreasSchwab:emacs:master/emacs/f/i586
>
> What does this error mean?
>
> In calculator-op:
> calculator.el:1289:32:Error: Forgot to expand macro pcase--flip in 
> (pcase--flip memql '(2 1) val)
> calculator.el:1289:32:Warning: reference to free variable ‘memql’
>
> In end of data:
> calculator.el:1664:1:Warning: the function ‘pcase--flip’ might not be defined
>     at runtime.
> calculator.el:1664:1:Warning: the function ‘check’ is not known to be defined.
> make[3]: *** [Makefile:296: calculator.elc] Error 1
>
> Andreas.

It sounds like it could a bug caused by [6: b8c74742c0], but it's not
happening here, or on hydra.

https://hydra.nixos.org/eval/1526398#tabs-still-succeed

[6: b8c74742c0]: 2019-06-19 11:20:58 +0200
  Tighter pcase or-pattern member function selection (bug#36139)
  
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=b8c74742c0238fe15b1cdc9a7f6ee021d038368f