Why Am I Getting an 'Undeclared Name 'any'' Error in Go 1.18?

Undeclared Name 'any' Error in Go 1.18

When attempting to substitute any for interface{} in your Go code while utilizing the Go 1.18 toolchain, you may encounter the following error:

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

Cause

This error arises because any is a recent addition to the Go language introduced in version 1.18. Your code may require a higher version of Go to utilize this feature.

Solution

To resolve this error, ensure that your go.mod file specifies a Go version equal to or greater than 1.18. For instance, modify your go.mod file to read:

module example.com/foo

go 1.18

Module Version Control

Each module's go.mod file governs the version of Go used during compilation. This allows for incremental adoption of language changes, with module authors choosing their preferred pace of integration. For more information, refer to the Go language changes design document.

Example

To illustrate this error, refer to the following Go playground example, which includes an editable go.mod file:

https://go.dev/play/p/au6TtTvNsRy

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