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Go 1.21 has added go/ast.IsGenerated. We should use it instead of the regexp when compiled with Go 1.21+.

From https://pkg.go.dev/cmd/go#hdr-Generate_Go_files_by_processing_source:

To convey to humans and machine tools that code is generated, generated source should have a line that matches the following regular expression (in Go syntax):

Notice that documentation even says should - it is just a recommendation.

The potential issue of generating code with such comments is that a lot of tools (e.g. https://github.com/golangci/golangci-lint) will ignore these files while people may want to have additional checks and refinements than just gofmt.