testing/synctest: remove Run in Go 1.26

[neild]

The experimental synctest package in Go 1.24 included a Run function. This package is only available when GOEXPERIMENT=synctest.

The non-experimental package in Go 1.25 replaces Run with Test. When GOEXPERIMENT=synctest, Run is still available to give early adopters a chance to migrate to the new API.

We will remove the Run function in Go 1.26. Creating an issue so we don't forget.

[gabyhelp]

Related Documentation

• Testing concurrent code with testing/synctest > Status of the experiment

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