Radar · Go · Archive · Week 6 · Feb 3 – 9, 2025

cmd/fix: automate migrations for simple deprecations

Worth knowingtooling

What changed

A new directive comment //go:fix inline can be placed before a function declaration to indicate that migration tooling should replace calls to that function with its body where possible.

Production impact

The source does not say.

Try it

Add //go:fix inline before a trivial function in a small package and run go fix ./... to see the replacement.

Source

github.com/golang/go/issues/32816

// This program demonstrates the new //go:fix inline directive.
// The directive is currently a no‑op for the compiler, but a future
// migration tool would replace calls to add with its body.
package main

import "fmt"

//go:fix inline
func add(a, b int) int {
	return a + b
}

func main() {
	// The call to add could be inlined by the migration tool.
	fmt.Println(add(3, 4))
}

7

// This does not compile until the //go:fix inline directive is supported.
package main

import "fmt"

//go:fix inline
func add(a, b int) int {
	return a + b
}

func main() {
	fmt.Println(add(3, 4))
}

Written by gpt-oss-20b from the linked source · claims checked against the sources · archive, not individually reviewed