feat(anyspawn): Make Spawner usable without features

[AdomasBekeras]

To use Spawner in a library, the library should not need to enable any features, it can just take a Spawner. This PR removes the feature gates from the Spaner and JoinHandle types

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (85ef2c7) to head (b7f0df2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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##             main     #343   +/-   ##
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  Coverage   100.0%   100.0%           
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  Files         210      210           
  Lines       15553    15553           
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  Hits        15553    15553           

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[martintmk]

I suggest to also have empty default features.

[github-actions]

⚠️ Breaking Changes Detected

--- failure feature_missing: package feature removed or renamed ---

Description:
A feature has been removed from this package's Cargo.toml. This will break downstream crates which enable that feature.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/feature_missing.ron

Failed in:
  feature custom in the package's Cargo.toml

--- failure feature_not_enabled_by_default: package feature is not enabled by default ---

Description:
A feature is no longer enabled by default for this package. This will break downstream crates which rely on the package's default features and require the functionality of this feature.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove-another
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/feature_not_enabled_by_default.ron

Failed in:
  feature tokio in the package's Cargo.toml

If the breaking changes are intentional then everything is fine - this message is merely informative.

Remember to apply a version number bump with the correct severity when publishing a version with breaking changes (1.x.x -> 2.x.x or 0.1.x -> 0.2.x).

[AdomasBekeras]

@microsoft-github-policy-service agree company="Microsoft"

[Copilot]

Pull request overview

This PR makes anyspawn::Spawner and anyspawn::JoinHandle available to downstream crates without requiring them to enable runtime features themselves, by removing feature-gating around the modules/exports and adjusting crate defaults and tests accordingly.

Changes:

• Removed tokio/custom feature gates around Spawner/JoinHandle modules and re-exports so the types are always available.
• Changed anyspawn default features to empty, and added “unconstructable” enum variants to keep types compiling when no runtime features are enabled.
• Moved integration test gating from #[cfg(feature = ...)] in test code to required-features entries in Cargo.toml.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/anyspawn/tests/spawner.rs	Removes per-test feature cfgs now that test enabling is controlled via required-features.
crates/anyspawn/tests/handle.rs	Removes feature gating in favor of required-features.
crates/anyspawn/tests/builder.rs	Removes file-level feature gating in favor of required-features.
crates/anyspawn/src/spawner.rs	Adds a no-feature-only SpawnerKind::None variant and match arms to keep compilation working without runtime features.
crates/anyspawn/src/lib.rs	Removes feature gating around handle/spawner modules and exports so types are always available.
crates/anyspawn/src/handle.rs	Adds a no-feature-only JoinHandleInner::None variant and adjusts poll to compile cleanly under different feature sets.
crates/anyspawn/Cargo.toml	Sets default = [] and adds required-features for tests/benches/examples.
Cargo.lock	Removes tick from the resolved dependency graph for this crate.

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[martintmk]

LGTM, but please address relevant copilot comments

[Copilot]

I suggest to also have empty default features.

Empty default features (default = []) are already set in Cargo.toml (added in commit 5d62209).

[Copilot]

Pull request overview

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 11 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

crates/anyspawn/tests/handle.rs:14

• With JoinHandle now available without any runtime feature, it would be useful to add a non-Tokio integration test that exercises the custom JoinHandle variant (e.g., created via Spawner::new_custom and awaited via futures::executor::block_on). As written, this test only runs under the tokio feature (via Cargo.toml gating), so the default featureless build won’t cover the Custom join-handle behavior or its Debug output.

#[cfg_attr(miri, ignore)]
#[tokio::test]
async fn join_handle_debug() {
    let spawner = Spawner::new_tokio();
    let handle = spawner.spawn(async { 42 });

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