chore(rust): Fix needless_doctest_main lint by updating parser_tsx example

[Copilot]

Summary

Fixes the needless_doctest_main clippy lint by updating the parser_tsx.rs example to match the expected pattern for doctests included in library documentation.

Root Cause

The needless_doctest_main lint was triggered because parser_tsx.rs is included as a doctest in the library documentation via:

//! ### Parsing TSX
//! ```rust
#![doc = include_str!("../examples/parser_tsx.rs")]
//! ```

Clippy expects doctests with fn main() to return a Result type to handle potential errors, not (). The parser.rs example didn't trigger this warning because it already returned Result<(), String>.

Changes Made

1. Removed lint suppression: Deleted needless_doctest_main = "allow" # FIXME from Cargo.toml

2. Updated function signature: Changed fn main() to fn main() -> Result<(), String> in parser_tsx.rs

3. Improved error handling: Added proper error handling to utilize the Result type:

   if panicked {
       return Err("Parser panicked".to_string());
   }
   
   if !errors.is_empty() {
       return Err(format!("Parsing errors: {}", errors.len()));
   }

4. Enhanced output: Added informative console output showing parse results

5. Added lint attribute: Added #![expect(clippy::print_stdout)] to allow console output in examples

Verification

• ✅ No needless_doctest_main warnings when running clippy
• ✅ Example runs successfully: cargo run -p oxc_parser --example parser_tsx
• ✅ All tests pass: just ready completes successfully
• ✅ Maintains consistency with other examples like parser.rs

The solution is minimal and surgical, only modifying 2 files with the smallest possible changes to resolve the lint issue while improving the example's robustness.

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #12996 will not alter performance

_{Comparing copilot/fix-13a6ed39-a6e0-4a77-ac4d-5c6a5c331d79 (b0a7132) with main (70f742a)}

Summary

✅ 34 untouched benchmarks

[Copilot]

Pull Request Overview

This PR fixes the needless_doctest_main clippy lint by updating the parser_tsx.rs example to return a Result type instead of (), which is the expected pattern for doctests included in library documentation.

• Changed fn main() to fn main() -> Result<(), String> in the parser_tsx example
• Removed the needless_doctest_main = "allow" lint suppression from Cargo.toml
• Improved error handling by replacing assertions with proper Result-based error handling

Reviewed Changes

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

File	Description
crates/oxc_parser/examples/parser_tsx.rs	Updated main function signature and error handling to return Result type
Cargo.toml	Removed needless_doctest_main lint suppression