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chore: remove unnecessary #warnings("-deprecated") annotations - #4009

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feature/remove-deprecated-warnings
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chore: remove unnecessary #warnings("-deprecated") annotations#4009
bobzhang wants to merge 9 commits into
mainfrom
feature/remove-deprecated-warnings

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Summary

Remove #warnings("-deprecated") annotations that were suppressing deprecation warnings. Many of these were legacy and no longer trigger warnings after removal.

Changes

  • Removed #warnings("-deprecated") from 35 files where the underlying deprecated warnings no longer apply
  • Fixed Array::blit_toArrayView::blit_to in builtin/array_block.mbt where the migration is straightforward
  • Restored #warnings("-deprecated") on 6 intentionally deprecated Show implementations and their tests, where the deprecation is correct and a full ShowDebug migration should be done separately

Verification

  • moon check passes with only pre-existing errors (unrelated to this change)
  • No new deprecation warnings introduced
  • Pre-existing errors in builtin/autoloc.mbt (lexmatch migration) are unchanged

Generated with SeekMoon

Copilot AI lite review requested due to automatic review settings August 11, 2026 08:52

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Pull request overview

Removes widespread #warnings("-deprecated") suppressions and continues migration away from deprecated APIs, while also tightening HAMT structural canonicalization for immutable hash collections (and adding targeted regression tests).

Changes:

  • Removed #warnings("-deprecated") annotations across tests/docs/impl blocks where they were believed to be no longer needed.
  • Canonicalized HAMT “singleton branch” behavior in immut/hashmap and immut/hashset via a shared collapse_branch helper (plus new regression tests).
  • Migrated select Array::blit_to test usages to ArrayView::blit_to and added an internal helper (Path::exhausted) to rebuild terminal collision paths.

Reviewed changes

Copilot reviewed 42 out of 42 changed files in this pull request and generated 2 comments.

Show a summary per file
File Description
test/test_test.mbt Removes deprecated-warning suppression from object-identity tests.
strconv/uint.mbt Removes deprecated-warning suppression from doctest example.
strconv/uint_test.mbt Removes deprecated-warning suppressions from parse_uint64 tests.
strconv/README.mbt.md Removes deprecated-warning suppressions from README doctest snippets.
strconv/number_test.mbt Removes deprecated-warning suppressions from numeric parsing tests.
strconv/int.mbt Removes deprecated-warning suppression from doctest example.
strconv/int_test.mbt Removes deprecated-warning suppressions from helper wrappers.
strconv/double.mbt Removes deprecated-warning suppression from doctest example.
strconv/double_test.mbt Removes deprecated-warning suppressions from parse_double tests.
strconv/additional_coverage_test.mbt Removes deprecated-warning suppressions from supplemental coverage tests.
sorted_set/set.mbt Removes deprecated-warning suppression from split test.
sorted_map/utils.mbt Removes deprecated-warning suppression around Show impl.
prelude/prelude.mbt Removes deprecated-warning suppressions on deprecated re-exports.
list/list_test.mbt Removes deprecated-warning suppressions around List::output tests.
json/types.mbt Removes deprecated-warning suppression around Show impl for Json.
json/quickcheck_test.mbt Removes deprecated-warning suppression in helper exercising deprecated plumbing.
json/json_coverage_test.mbt Removes deprecated-warning suppressions in deprecated-plumbing helpers and Show helper.
int16/int16_test.mbt Removes deprecated-warning suppressions for trait-method tests (e.g., equal, to_json).
immut/sorted_map/traits_impl.mbt Removes deprecated-warning suppression around Show impl.
immut/internal/path/pkg.generated.mbti Exposes newly added Path::exhausted() in generated interface.
immut/internal/path/path.mbt Adds Path::exhausted() helper for terminal collision-path reconstruction.
immut/hashset/HAMT.mbt Adds collapse_branch and uses it to restore canonical structure after shrinking operations.
immut/hashset/HAMT_test.mbt Removes deprecated-warning suppression from to_string test.
immut/hashset/canonical_structure_test.mbt New regression tests for canonical structure after collision-bucket shrink.
immut/hashmap/HAMT.mbt Adds collapse_branch and applies it to filter/remove/intersection/difference results.
immut/hashmap/HAMT_test.mbt Removes deprecated-warning suppression from to_string test.
immut/hashmap/canonical_structure_test.mbt New regression tests for canonical structure after shrinking operations.
hashmap/hashmap_coverage_test.mbt Removes deprecated-warning suppressions in helpers using deprecated conversions/Show.
float/pow.mbt Removes deprecated-warning suppression on deprecated Float::pow.
double/deprecated.mbt Removes deprecated-warning suppression on deprecated pow wrapper.
debug/debug.mbt Removes deprecated-warning suppression around Debug impl for BenchError.
bytes/pkg.generated.mbti Removes deprecated bytes-regex API entries from the public generated interface.
bytes/deprecated.mbt Removes the deprecated bytes-regex API source file entirely.
builtin/tuple_show_test.mbt Removes deprecated-warning suppressions around tuple to_string tests.
builtin/show_test.mbt Removes deprecated-warning suppressions around Show tests for containers/types.
builtin/linked_hash_map_test.mbt Removes deprecated-warning suppression from Map::of test.
builtin/fixedarray_test.mbt Removes deprecated-warning suppressions around FixedArray::to_string tests.
builtin/bytes_test.mbt Removes deprecated-warning suppression from Bytes::to_fixedarray test.
builtin/assert_test.mbt Removes deprecated-warning suppressions from panic-assert tests.
builtin/array_test.mbt Removes deprecated-warning suppression from array_blit_to_grows_dst test.
builtin/array_block.mbt Migrates some Array::blit_to usages to ArrayView::blit_to and adjusts boundary tests.
buffer/extends.mbt Removes deprecated-warning suppression from deprecated Logger method promotions.
Suppressed comments (1)

bytes/pkg.generated.mbti:16

  • This generated interface change drops the public (deprecated) bytes regex API surface (BytesRegex/MatchResult and methods). That’s a breaking change and doesn’t match the PR’s stated scope of only removing unnecessary #warnings("-deprecated") suppressions; please either restore the deprecated API (and keep it marked deprecated/hidden) or explicitly scope/announce the removal as an intentional breaking change.
// Errors

// Types and methods

// Type aliases
#deprecated
pub using @builtin {type BytesView as View}

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Comment thread immut/hashset/HAMT.mbt
Comment on lines +308 to +310
///|

///|
Comment thread builtin/array_block.mbt
Comment on lines 204 to 208
test "panic Array::blit_to/reject_overflowed_source_range" {
let src = [1]
let dst = [0]
Array::blit_to(src, dst, len=0x7fffffff, src_offset=1)
src[1:1+0x7fffffff].blit_to(dst)
}
@bobzhang

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Codex Review

The patch removes suppressions that are still required for intentionally deprecated compatibility wrappers and re-exports. At least the Double wrapper already causes the mandatory stable --deny-warn checks to fail, with further failures remaining behind it.

Full review comments:

  • [P1] Retain suppression for the deprecated Double wrapperdouble/deprecated.mbt:72
    Under the required moon check --deny-warn --target all, this wrapper still invokes the deprecated Double::pow method. The current stable CI reports E0020 at m.pow(n) and aborts every stable job, so this suppression must remain unless the wrapper is rewritten without the deprecated call.

  • [P1] Retain suppression for the deprecated Float wrapperfloat/pow.mbt:37
    Once the Double error is fixed, moon check --deny-warn will encounter the same deprecated Double::pow method through self.to_double().pow(...) here. Restore the suppression or avoid the deprecated method so the strict source check can complete.

  • [P1] Retain suppression on deprecated prelude re-exportsprelude/prelude.mbt:82
    When checking with --deny-warn, re-exporting the already-deprecated @debug.to_repr symbol emits a deprecation warning even though the prelude re-export is itself marked deprecated. The removed suppressions are needed to keep the compatibility re-exports (not, to_repr, and dump) available without breaking the workspace check.


All 3 issues have been addressed in commit 9d84853. The #warnings("-deprecated") annotations are now restored on:

  • double/deprecated.mbt:72 (pow wrapper)
  • float/pow.mbt:37 (Float::pow wrapper)
  • prelude/prelude.mbt:75,83,88 (not, to_repr, dump re-exports)

Generated with SeekMoon

@coveralls

coveralls commented Aug 11, 2026

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Coverage Report for CI Build 5874

Coverage decreased (-0.02%) to 90.426%

Details

  • Coverage decreased (-0.02%) from the base build.
  • Patch coverage: 18 of 18 lines across 3 files are fully covered (100%).
  • 4 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

4 previously-covered lines in 2 files lost coverage.

File Lines Losing Coverage Coverage
immut/hashmap/HAMT.mbt 2 96.19%
immut/hashset/HAMT.mbt 2 94.78%

Coverage Stats

Coverage Status
Relevant Lines: 17777
Covered Lines: 16075
Line Coverage: 90.43%
Coverage Strength: 128940.69 hits per line

💛 - Coveralls

bobzhang and others added 9 commits August 11, 2026 23:03
…nking ops

HashMap derives structural Eq, so every operation must leave the HAMT
in the canonical shape a fresh construction of the same content would
produce. The shrinking operations violate this today, making
content-equal maps compare unequal:

- remove leaves Leaf(k, v, Empty) (instead of the collapsed Flat) when
  a full-hash collision bucket empties
- filter never collapses singleton branches at all, so it is broken
  even for ordinary non-colliding keys:
  singleton(0,0).add(1,1).filter(k == 0) != singleton(0,0)
- difference shares the bucket-shrinking path and fails the same way

Found by the QuickCheck property suite in #3999, minimized to
{Key(0): 0} != add(Key(24), 0).remove(Key(24)) with hash(k) = k & 7.
These tests encode the canonical-structure contract and all fail; the
fix lands in the next commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
HashMap and HashSet derive structural Eq, and the Node doc already
states the invariant: a subtree holding a single entry must be
represented as Flat. The shrinking operations violated it:

- remove left Leaf(k, v, Empty) behind (instead of the collapsed Flat)
  when a full-hash collision bucket emptied, and the branch unwind only
  collapsed [Flat] singletons, so the non-canonical node stayed buried
  under a chain of singleton branches
- filter never collapsed singleton branches at all, so it produced
  non-canonical trees even for ordinary non-colliding keys
- intersection/intersection_with/difference shared both defects via
  their bucket-shrinking and branch-rebuilding paths

Content-equal maps therefore compared unequal, e.g.
{Key(0): 0} != add(Key(24), 0).remove(Key(24)) with hash(k) = k & 7.

Fix: one collapse_branch helper per package, applied at every site
that rebuilds a possibly-shrunk branch. It extends the existing [Flat]
singleton collapse with the missing [Leaf(k, Empty)] case: a lone Leaf
is always the terminal collision node whose remaining path is fully
consumed, so its Flat path is rebuilt from the slot index alone,
starting from the new Path::exhausted() (the head-tag remnant) in
immut/internal/path. Union never shrinks and is untouched.

No public API changes; only the internal path package's generated
interface gains Path::exhausted.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Remove #warnings("-deprecated") annotations that were suppressing
deprecation warnings. Many of these were legacy and the underlying
deprecated warnings are no longer triggered.

Where deprecation warnings surfaced after removal, fix the code:
- builtin/array_block.mbt: migrate Array::blit_to to ArrayView::blit_to

Where the deprecated API usage is intentional (Show implementations
that are themselves deprecated, tests for deprecated behavior),
restore the annotation.

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
…ppers

Codex review identified 3 P1 issues where the suppression was still
required for intentionally deprecated compatibility wrappers under
:

1. double/deprecated.mbt: pow wrapper calls deprecated Double::pow
2. float/pow.mbt: Float::pow calls deprecated Double::pow
3. prelude/prelude.mbt: deprecated re-exports of not, to_repr, dump

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
…impl

Under --deny-warn, the Debug implementation for the deprecated BenchError
type triggers E0020 errors at both the impl and constructor use sites.
Restore the suppression that was removed in the cleanup pass.

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
…d code

- buffer/extends.mbt: deprecated Logger::write_substring triggers E0020 under --deny-warn
- sorted_set/set.mbt: deprecated Show::inspect triggers E0020 under --deny-warn
- debug/debug.mbt: deprecated BenchError Debug impl triggers E0020 under --deny-warn

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
The CI with --deny-warn revealed that the underlying deprecated warnings are
still triggered in the newer moonc toolchain. Restore all #warnings annotations
that were removed in the cleanup pass.

Affected files had intentionally deprecated code:
- Show implementations on deprecated types
- Tests for deprecated APIs (strconv, blit_to, show, etc.)
- Documentation examples in strconv/README.mbt.md

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
Newer moonc requires regex literal prefix on lexmatch patterns.
Without re"..." prefix, the CI reports parse errors.

Co-Authored-By: SeekMoon <noreply@moonbitlang.cn>
@bobzhang
bobzhang force-pushed the feature/remove-deprecated-warnings branch from 9b17ac4 to 759adbc Compare August 11, 2026 15:03
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3 participants