Undelayed expansion use case?

undelayed-expansion-ridik.cmd

SETLOCAL
CALL test.cmd
IF ERRORLEVEL 1 (
	SET TESTRET=1
) ELSE (
	: # Do something with some envvars that test.cmd set that
	: # we want to protect our own cmd code from.
)
: # Rely on undelayed expansion semantics to communicate variables
: # out of the SETLOCAL/ENDLOCAL :-D. Though, I suspect that if
: # the variable contains a closing paren, this’ll break.
IF 0 == 0 (
	ENDLOCAL
	SET TESTRET=%TESTRET%
)