MERCURY_OPTIONS= --deep-random-write=25 --mdb-disable-progress
make[3]: Entering directory '/mnt/testing/run/build/mercury-srcdist-rotd-2020-10-19/tests/invalid'
if /mnt/testing/run/build/mercury-srcdist-rotd-2020-10-19/stage2/scripts/mmc --target-code-only --grade asm_fast.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS -O5 --intermod-opt -O0 --optimise-tailcalls --no-warn-non-tail-recursion   \
	require_tailrec_1 > require_tailrec_1.err 2>&1; \
then false; \
else true; \
fi
Comparing require_tailrec_1.err with require_tailrec_1.err_exp*,
	results in require_tailrec_1.err_res
** require_tailrec_1.err did not match the expected error output
** (closest match was require_tailrec_1.err_res1)
--- require_tailrec_1.err_exp	2020-10-11 14:28:49.000000000 +1100
+++ require_tailrec_1.err	2020-10-21 05:41:31.057808694 +1100
@@ -2,9 +2,12 @@
 require_tailrec_1.m:050:   warning: self-recursive call is not tail recursive.
 require_tailrec_1.m:057: In mode number 1 of predicate `map2'/3:
 require_tailrec_1.m:057:   warning: self-recursive call is not tail recursive.
-require_tailrec_1.m:065: In mode number 1 of function `even1'/1:
-require_tailrec_1.m:065:   warning: mutually recursive call to function
-require_tailrec_1.m:065:   `odd1'/1 is not tail recursive.
+require_tailrec_1.m:069: In `:- pragma require_tail_recursion' for function
+require_tailrec_1.m:069:   `odd1'/1:
+require_tailrec_1.m:069:   warning: the code defining this function contains no
+require_tailrec_1.m:069:   recursive calls at all, tail-recursive or otherwise.
+require_tailrec_1.m:074: In mode number 1 of function `even1'/1:
+require_tailrec_1.m:074:   warning: self-recursive call is not tail recursive.
 require_tailrec_1.m:085: In mode number 1 of predicate `qsortapp_1'/2:
 require_tailrec_1.m:085:   warning: self-recursive call is not tail recursive.
 require_tailrec_1.m:103: In mode number 1 of predicate `qsortapp_3'/2:
../Mmake.common:169: recipe for target 'require_tailrec_1.err_res' failed
make[3]: *** [require_tailrec_1.err_res] Error 1
make[3]: Target 'require_tailrec_1.runtest' not remade because of errors.
make[3]: Leaving directory '/mnt/testing/run/build/mercury-srcdist-rotd-2020-10-19/tests/invalid'