Why Does Go 1.18 Report 'undeclared name: any'?

Why Does "any" Cause the Error "undeclared name" When Using Go 1.18?

When attempting to substitute "any" for "interface{}", Go 1.18 users may encounter the error "undeclared name: any (requires version go1.18 or later)." This error arises due to a mismatch between the Go version specified in your go.mod file and the version of Go you are using.

The "any" keyword was introduced in Go 1.18. To use it, your go.mod file must specify a Go version of 1.18 or later. If your go.mod file declares a version below 1.18, such as 1.17, you will encounter the error.

Solution:

To resolve this error, adjust your go.mod file to reflect the Go version you are using (1.18 or higher). For instance, if your go.mod file reads:

module example.com/foo

go 1.17

Modify it to:

module example.com/foo

go 1.18

This change allows your code to use the "any" keyword and avoid the error. Keep in mind that each module's go.mod file governs the Go version used for compilation. This approach enables module authors to gradually adopt language enhancements at their preferred pace.

For a practical example, visit the following playground link: https://go.dev/play/p/au6TtTvNsRy. Here, you can edit the go.mod file to demonstrate the error and its resolution.

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