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mercury/library
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Nadia Yvette Chambers fa271a0ec8 Fix integer.mul_by_digit producing denormalized zeros. (#141) 
mul_by_digit(0, Y) produced i(Len, [0, 0, ...]) instead of the
canonical integer.zero = i(0, []). Since is_zero/1 only matched
the canonical form, denormalized zeros were silently treated as
nonzero, causing incorrect results in rational.m (e.g., gcd_2
non-termination, division-by-zero crashes in big_quot_rem).

Three fixes applied:
- Guard mul_by_digit and printbase_mul_by_digit to return
  integer.zero when the digit is 0 (root cause fix).
- Make is_zero/1 recognize denormalized all-zero digit lists
  as defense in depth.
- Replace structural `= integer.zero` checks in rational.m
  with integer.is_zero/1 calls for robustness.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-14 09:35:20 +11:00
..
.gitignore
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.mgnuc_copts
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.mgnuc_opts
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.nocopyright
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array2d.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
array.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
assoc_list.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
backjump.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
bag.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
benchmarking.m
…
bimap.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
bit_buffer.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
bit_buffer.read.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
bit_buffer.write.m
…
bitmap.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
bool.m
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bt_array.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
builtin.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
calendar.m
Improve the documentation of the calendar module.
2026-03-13 20:08:25 +11:00
char.m
Adjust char module documentation.
2026-02-25 22:06:42 +11:00
construct.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
cord.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
counter.m
…
deconstruct.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
diet.m
Add uint versions of length and count operations.
2026-01-02 15:35:20 +11:00
digraph.m
Compile the Mercury system with --warn-unused-types.
2026-03-09 03:07:51 +11:00
dir.m
Add some missing semicolons.
2026-03-14 01:59:56 +11:00
edit_distance.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
edit_seq.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
enum.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
eqvclass.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
exception.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
fat_sparse_bitset.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
fatter_sparse_bitset.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
float.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
gc.m
…
getopt_io.m
Fix incorrect obsolete pragma.
2026-02-28 00:15:22 +11:00
getopt.m
Fix incorrect obsolete pragma.
2026-02-28 00:15:22 +11:00
hash_table.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
injection.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
int8.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
int16.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
int32.m
Fix typos.
2026-03-08 02:04:04 +11:00
int64.m
Fix typo.
2026-03-07 00:32:26 +11:00
int.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
integer.m
Fix integer.mul_by_digit producing denormalized zeros. (#141)
2026-03-14 09:35:20 +11:00
INTER_FLAGS
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INTER_FLAGS_MMC_MAKE
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io.call_system.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.environment.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.error_util.m
…
io.file.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.m
Fix omission in documentation of io.set_output_line_number.
2026-03-13 14:18:03 +11:00
io.primitives_read.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.primitives_write.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.stream_db.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
io.stream_ops.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
io.text_read.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
kv_list.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
lazy.m
…
LIB_FLAGS.in
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library_strong_name.sn
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library.m
Enable dense switches on sized and unsigned ints.
2026-03-04 19:51:35 +11:00
list.m
Delete an extraneous space.
2026-03-13 12:44:54 +11:00
map.m
Fix map.union_list/4 documentation.
2026-03-03 13:01:00 +11:00
math.m
Minor documentation fix.
2026-02-18 15:08:23 +11:00
maybe.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
mer_std.m
…
mer_std.trans_opt_deps_spec
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mercury_term_lexer.m
Fix documentation and formatting.
2026-02-12 21:59:25 +11:00
mercury_term_parser.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
Mercury.options
Use spaces in all Mercury.options files.
2025-12-06 10:39:04 +11:00
Mmakefile
Remove workarounds for depend_ints on Windows.
2026-01-07 16:55:55 +11:00
MODULES_DOC
…
MODULES_UNDOC
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multi_map.m
Add uint versions of length and count operations.
2026-01-02 15:35:20 +11:00
mutvar.m
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one_or_more_map.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
one_or_more.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
ops.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
pair.m
…
par_builtin.m
…
parsing_utils.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
pprint.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
pqueue.m
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pretty_printer.m
Documentation and obsolete pragma fixes.
2026-02-18 23:31:27 +11:00
print_extra_inits
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private_builtin.m
Warn about singletons for *all* foreign procs.
2026-01-29 22:09:58 +11:00
profiling_builtin.m
Pass the CSD arg to profiling builtins explicitly.
2026-01-29 00:11:37 +11:00
prolog.m
More library fixes.
2026-02-20 23:57:09 +11:00
psqueue.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
queue.m
…
ra_list.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
random.m
Adjust documentation for random.normal_floats/7.
2026-02-18 15:31:30 +11:00
random.sfc16.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
random.sfc32.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
random.sfc64.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
random.system_rng.m
Better document error behaviour in random.system_rng.
2026-02-24 21:08:25 +11:00
ranges.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
rational.m
Fix integer.mul_by_digit producing denormalized zeros. (#141)
2026-03-14 09:35:20 +11:00
rbtree.m
Fix rbtree.count and rbtree.ucount.
2026-02-20 13:40:40 +11:00
region_builtin.m
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require.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
RESERVED_MACRO_NAMES
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robdd.m
Fix spelling.
2025-12-07 14:17:02 +11:00
rtree.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
rtti_implementation.m
More library fixes.
2026-02-20 23:57:09 +11:00
set_bbbtree.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
set_ctree234.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
set_ordlist.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
set_tree234.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
set_unordlist.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
set.m
Fix documentation of set.map2_fold/6.
2026-02-18 21:05:36 +11:00
solutions.m
…
sparse_bitset.m
Fix documentation and formatting.
2026-02-12 21:59:25 +11:00
stack.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
std_util.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
stm_builtin.m
Ignore (mostly) comments inside foreign_procs.
2026-01-28 13:34:30 +11:00
store.m
More standard library fixes.
2026-02-20 14:42:38 +11:00
stream.m
Fix method reference in stream documentation.
2026-02-12 14:04:05 +11:00
stream.string_writer.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
string.builder.m
…
string.format.m
…
string.m
Add a missing comma.
2026-03-13 14:47:28 +11:00
string.parse_runtime.m
…
string.parse_util.m
…
string.to_string.m
…
table_builtin.m
More library fixes.
2026-02-20 23:57:09 +11:00
table_statistics.m
…
term_context.m
…
term_conversion.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
term_int.m
…
term_io.m
Fix bug in term_io.format_term_nl/5.
2026-02-20 16:03:18 +11:00
term_size_prof_builtin.m
Ignore (mostly) comments inside foreign_procs.
2026-01-28 13:34:30 +11:00
term_subst.m
Library documentation fixes.
2026-02-20 16:20:42 +11:00
term_to_xml.m
Library documentation fixes.
2026-02-20 16:20:42 +11:00
term_unify.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
term_vars.m
Fix more library documentation errors.
2026-01-23 19:53:58 +11:00
term.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
test_bitset.m
Add uint versions of length and count operations.
2026-01-02 15:35:20 +11:00
thread.barrier.m
Fix errors in thread.barrier.
2026-02-16 14:18:33 +11:00
thread.channel.m
Improve the documentation of some library modules.
2026-01-24 02:05:07 +11:00
thread.closeable_channel.m
…
thread.future.m
Fix errors in thread.future.
2026-02-16 14:30:14 +11:00
thread.m
Rationalise foreign_proc attributes in stdlib.
2026-02-20 19:19:26 +11:00
thread.mvar.m
…
thread.semaphore.m
…
time.m
Do not use bitwise and on booleans in Java.
2026-02-22 03:03:32 +11:00
tree234.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
tree_bitset.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
type_desc.m
Fix problems in the library.
2026-02-19 15:24:59 +11:00
uint8.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
uint16.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
uint32.m
Move the to_int predicates into the standard library.
2026-03-06 20:32:20 +11:00
uint64.m
Move the to_int predicates into the standard library.
2026-03-06 20:32:20 +11:00
uint.m
Add clamp/3 for other primitive integer types.
2026-03-05 16:54:47 +11:00
unit.m
…
univ.m
Fix library documentation errors.
2026-01-22 21:22:38 +11:00
varset.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
version_array2d.m
Fix an incorrect error message in an exception.
2026-02-27 20:16:56 +11:00
version_array.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
version_bitmap.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
version_hash_table.m
More library documentation fixes.
2026-02-20 21:05:08 +11:00
version_store.m
Fix errors in version_store documentation.
2026-02-16 14:06:32 +11:00