ci(rust): bump mlua from 0.11.6 to 0.12.0

[dependabot]

Bumps mlua from 0.11.6 to 0.12.0.

Release notes

Sourced from mlua's releases.

v0.12.0

Highlights

More ergonomic UserData building blocks

• Declaratively implement UserData with #[derive(UserData)] and register methods/fields with the new #[mlua::userdata_impl] attribute macro.
• UserDataOwned<T> wrapper takes ownership of userdata and implements FromLua
• UserDataMethods::add_method_once/add_async_method_once
• __todebugstring metamethod for pretty-printing userdata when debugging
• MaybeSync trait for userdata under the send feature

Reorganized public API

Types are now grouped into focused modules: chunk, debug, error, function, table, string, state, thread, userdata and luau.

Thread lifecycle callbacks

Hook into coroutine create/resume/yield events across all Lua versions (when using mlua API).

Luau improvements

Latest Luau with extended require-by-string support and JIT options.

Garbage-collector interface refactor

Lua::gc_inc / Lua::gc_gen are replaced by a Lua::gc_set_mode, with GcIncParams/GcGenParams for fine-grained tuning.

What's Changed (since v0.12.0-rc.2)

• Crate root re-exports are refactored (only essentials are re-exported, the rest is in the new submodules)
• Added ThreadStatus::Normal and Thread::is_normal (mimic coroutine.status)
• Added Lua::set_jit_options with support of Luau JIT inliner (Luau)
• Added Value::as_vector/Value::is_vector (Luau)
• Added Table::remove
• serde: tables with the array metatable are always encoded as arrays (incl. detect_mixed_tables option)
• impl Hash for BorrowedStr/BorrowedBytes
• Lua::current_thread resolves implicit async threads to their root owner (#706)
• Bugfixes and improvements

Full Changelog: mlua-rs/mlua@v0.11.6...v0.12.0

v0.12.0-rc.2

The new stable version is almost ready and will be released after some testing

What's Changed

• Add #[derive(UserData)] and #[userdata_impl] macros
• Support thread create/resume/yield callbacks for all Lua versions (including Luau)
• Support to_alias_override/to_alias_fallback in Require trait (Luau)
• Prevent XRc overflow when dropping RawLua with foreign Lua state

... (truncated)

Changelog

Sourced from mlua's changelog.

v0.12.0 (Jul 05, 2026)

Changes since v0.12.0-rc.2

• Create root re-exports are refactored (only essentials are re-exported, the rest is in the new submodules)
• Added ThreadStatus::Normal and Thread::is_normal (mimic coroutine.status)
• Added Lua::set_jit_options with support of Luau JIT inliner (Luau)
• Added Value::as_vector/Value::is_vector (Luau)
• Added Table::remove
• serde: tables with the array metatable are always encoded as arrays (incl. detect_mixed_tables option)
• impl Hash for BorrowedStr/BorrowedBytes
• Lua::current_thread resolves implicit async threads to their root owner (#706)
• Bugfixes and improvements

v0.12.0-rc.2 (Jun 06, 2026)

• Add #[derive(UserData)] and #[mlua::userdata_impl] macros
• Support thread create/resume/yield callbacks for all Lua versions (including Luau)
• Support to_alias_override/to_alias_fallback in Require trait (Luau)
• Prevent XRc overflow when dropping RawLua with foreign Lua state
• implement Not for StdLib (#699)
• Fix String::to_pointer return NULL in Lua <5.4

v0.12.0-rc.1 (Apr 21, 2026)

• Rust 2024 edition
• Removed Error::ToLuaConversionError variant as it was unused (and not practically useful)
• New modules to group data types: chunk, debug, error, function, table, string, state, thread, userdata, luau
• Support __todebugstring metamethod for pretty formatting userdata value (for debugging)
• New MaybeSync trait that is required for userdata types
• Removed lifetime from BorrowedStr and BorrowedBytes
• New Thread methods: is_resumable, is_running, is_finished, is_error
• Added Thread::state to get raw Lua state pointer
• Luau TextRequirer is renamed to FsRequirer
• GC interface refactor: Lua::gc_inc/Lua::gc_gen is replaced with gc_set_mode
• Added GcIncParams and GcGenParams for GC tuning
• New UserDataMethods::add_method_once and UserDataMethods::add_async_method_once
• Initial Luau integer64 type support
• Changed interface of Function::wrap/wrap_mut/wrap_async to support any Error type
• Changed AnyUserData::type_name to return LuaString instead
• Added UserDataOwned<T> wrapper to take ownership of userdata T and implements FromLua

Commits

• 8eddf85 v0.12.0
• 46d3783 Update CHANGELOG
• 7ddcdc1 Add Table::remove
• 6b19eeb Make VmState as non_exhaustive
• b64da48 Make NavigateError as non_exhaustive (Luau)
• cddbcc5 Refactor crate-root re-exports and drop hidden backward-compat aliases
• 1af17ec Various doc updates and refinement
• eef5985 Rename LuaJitOptions to LuauJitOptions in prelude
• 9099d5f Rename JitOptions::set_inliner to JitOptions::inliner for consistency
• 34825d6 Fix Lua::gc_set_mode panic when GC is internally stopped (Lua 5.4/5.5)
• Additional commits viewable in compare view

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[dependabot]

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[strandly-the-agent]

Triage: ✅ Accept (lightweight review)

TL;DR: CI passed; shell's mlua usage is narrow and unaffected by 0.12.0's breaking changes. Safe to merge.

Analysis

What changed

mlua 0.12.0 reorganized the public API into focused submodules and refactored the garbage-collector interface (gc_inc/gc_gen → gc_set_mode).

Why it's safe for shell

Shell's lua.rs uses only basic mlua types, all prelude-stable:

• mlua::HookTriggers — Timeout hook setup (line 166)
• mlua::VmState::Continue — Hook return value (line 184)
• mlua::Value::Nil — Basic enum variant (line 215)

The breaking changes target advanced features shell doesn't use:

• ✗ No custom UserData (no MaybeSync trait impact)
• ✗ No Lua::gc_inc/gc_gen calls
• ✗ No Function::wrap or AnyUserData::type_name calls

Risk mitigation

✓ CI already passed (Dependabot runs checks before opening PR)
✓ mlua 0.12.0 is stable and well-maintained (released Jul 05, 2026)
✓ mlua is a leaf dependency (low transitive risk)

Recommendation

Route: Lightweight review → merge

• Verify CI green (already done)
• No code changes needed