The attached file crashes PSPP with tip of current master:

pspp: ../src/language/commands/ctables.c:2438: nest_fts: Assertion `0' failed.
******************************************************
You have discovered a bug in PSPP.  Please report this
to bug-gnu-pspp@gnu.org.  Please include this entire
message, *plus* several lines of output just above it.
For the best chance at having the bug fixed, also
include the syntax file that triggered it and a sample
of any data file used for input.
proximate cause:     Assertion Failure/Abort
version:             GNU pspp 2.0.1
host_system:         x86_64-pc-linux-gnu
build_system:        x86_64-pc-linux-gnu
locale_dir:          /usr/share/locale
compiler version:    14.1.1 20240522 (Red Hat 14.1.1-4)
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Aborted (core dumped)