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[no subject]

You guys are so stingy with temporary locations!
UNBND3 and PNMK1 seem to be the same place.
Consider what happens if a PDLNMK saves TT in PNMK1 at NMK1, then goes to
FLCONS, which calls AGC4, which runs some GC daemon, which specbinds
something, runs code, calls UNBIND, which clobbers UNBND3 (i.e. PNMK1),
ultimately returning to PNMK2, restoring TT from the (clobbered) PNMK1.