Why Does 'go build' Fail with 'build constraints exclude all Go files in golang.org/x/net/route'?

Build Constraints Exclude Go Files in Golang.org/X/Net/Route

When importing "golang.org/x/net/route" into a Go project, you may encounter the error message "build constraints exclude all Go files in go/src/golang.org/x/net/routego." This error indicates that the build constraints defined within the "golang.org/x/net/route" package prevent the inclusion of its Go files in the current build environment.

Solution

To resolve this issue and successfully import "golang.org/x/net/route," perform the following steps:

1. Run the "go clean -modcache" command in the terminal or command line. This command clears the module cache and ensures that the latest version of the "golang.org/x/net/route" package is downloaded.
2. Rebuild the project using the "go build" command.

By following these steps, you should be able to resolve the build constraint error and successfully import "golang.org/x/net/route" into your Go project.

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