[m-dev.] Problem compiling G12 in debug grade on Saturn

[Ralph Becket]

I've added `GRADE=asm_fast.gc.tr.debug' to Mercury.params in
g12/zinc/compiler on a new workspace on saturn, and run make.

I get this:

Making Mercury/asm_fast.gc.tr.debug/x86_64-unknown-linux-gnu/Mercury/cs/flatzinc.c
Making Mercury/asm_fast.gc.tr.debug/x86_64-unknown-linux-gnu/Mercury/cs/flatzinc_colgen_solver.c
Making Mercury/asm_fast.gc.tr.debug/x86_64-unknown-linux-gnu/Mercury/cs/flatzinc_conf.c
Uncaught Mercury exception:
Software Error: map.lookup: key not found
        Key Type: term.var(parse_tree.prog_data.prog_var_type)
        Key Value: var(16)
        Value Type: ll_backend.var_locn.var_state
Stack dump not available in this grade.
** Error making `Mercury/asm_fast.gc.tr.debug/x86_64-unknown-linux-gnu/Mercury/cs/flatzinc_conf.c'.
make: *** [install] Error 1

Does that look familiar to anyone?
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