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Software Engineering
The Go Blog·5 min read
//go:fix inline and the source-level inliner
TL;DR
Go developers faced friction when migrating APIs because manual code updates were tedious and error-prone. Go 1.26 introduced a source-level inliner—a compiler feature that automatically expands function calls inline at the source code level—plus the //go:fix directive for self-service migrations.
✦ Why It Matters
You can now automate API migrations and reduce manual refactoring effort across large Go codebases.
Key Takeaways
- Utilize //go:fix inline to update deprecated function calls.
- Leverage the inliner for safer API migrations in your projects.
- Run go fix regularly to keep your codebase modern.
- Explore gopls for real-time diagnostics on inlining opportunities.
How It Works
The source-level inliner replaces function calls with the body of the called function, ensuring that arguments are correctly substituted for parameters. It handles complexities like parameter elimination, side effects, and shadowing to maintain code correctness during inlining.