Now is never

[MusicalNinjaDad]

update tests & examples to work with stabilised-in-nightly never_type

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="crates/try_v2/src/lib.rs" line_range="11" />
<code_context>
 //!
 //!   - nightly
-//!   - `#![feature(never_type)]`
+//!   - `#![cfg_attr(unstable_never_type, feature(never_type))]`
 //!   - `#![feature(try_trait_v2)]`
 //!   - `#![feature(try_trait_v2_residual)]`
</code_context>
<issue_to_address>
**issue:** The documented `cfg_attr(unstable_never_type, feature(never_type))` does not enable `never_type` for downstream crates, because `unstable_never_type` is emitted by this package's build script only for this package's compilation and is not propagated to consumers. On a pre-stabilization nightly, users copying these examples therefore compile the generated `!` residual types without the required feature and receive a never-type feature-gate error.

**Triggers:** When a consumer uses a pinned nightly older than the stabilization of `never_type` and follows the crate or derive-macro documentation.

**Suggested fix:** Document an unconditional `#![feature(never_type)]` for downstream users, or provide a separately documented consumer-side version/cfg mechanism rather than relying on this crate's private build-script cfg.
</issue_to_address>

Sourcery assessment

Approval pending. 1 finding to address first.

Blocking findings: crates/try_v2/src/lib.rs:11

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