Why Does Go 1.18 Produce 'Undeclared Name: any' Errors?

Why Does "any" Cause "Undeclared Name" Errors When Upgrading to Go 1.18?

When upgrading your Go project to version 1.18 and attempting to leverage the new "any" type as a replacement for "interface{}", you may encounter an error similar to:

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

This error arises because the "go.mod" file associated with your project specifies a Go version less than 1.18. The "any" type was introduced in Go 1.18, and modules specifying earlier versions are not eligible to use it.

Resolution

To resolve this issue, update the "go.mod" file to use Go version 1.18 or above. For example, change the following:

module example.com/foo

go 1.17

to:

module example.com/foo

go 1.18

Justification

Each module's "go.mod" file controls the Go language version used during compilation, allowing for gradual adoption of new features by module authors at their discretion. As explained in the [Go language changes design document](https://go.dev/design/go-version-check), this ensures compatibility across components and modules.

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