Go 1.18 'undeclared name: any' Error: How Do I Fix It?

Unexpected Error: Undeclaring 'any' When Using Go 1.18

While using the Go 1.18 toolchain and attempting to substitute interface{} with any, you may encounter the following error:

undeclared name: any (requires version go1.18 or later)

Cause of the Issue:

The 'any' type was introduced in Go 1.18. If your go.mod file specifies a Go version lower than 1.18, the 'any' type will not be recognized.

Solution:

To resolve the error, update the go.mod file to indicate that your module requires Go version 1.18 or higher. For example:

module example.com/foo

go 1.18

Additional Notes:

• Each module's go.mod file specifies the Go version used during compilation.
• This allows for gradual adoption of new language features, with authors opting in at their own pace.
• For further information, refer to the Go language changes design document: https://blog.golang.org/go1.18.
• A playground example demonstrating this issue and providing an editable go.mod file can be found here: https://go.dev/play/p/au6TtTvNsRy

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