Why Does Go Return 'Can't Load Package: Package my_prog: Found Packages my_prog and main'?

Error: "Can't Load Package: Package my_prog: Found Packages my_prog and main"

In Go, each package must reside in a separate directory within the GOPATH. When you encounter the error "can't load package: package my_prog: found packages my_prog and main," it indicates that you have multiple packages defined with the same name but in different directories.

In your case, you have:

• main.go in the /src/my_prog/main.go directory, which defines the main package
• d_interface.go and d_struct_that_implements_the_interface.go in the /src/my_prog directory, which both define the my_prog package

To resolve this issue, you need to move the files d_interface.go and d_struct_that_implements_the_interface.go into a new directory within GOPATH/src and give it a unique name, such as my_prog_pkg. The updated structure would look like this:

/bin/
/pkg/
/src/
/src/main/
/src/main/main.go
/src/my_prog_pkg/
/src/my_prog_pkg/d_interface.go
/src/my_prog_pkg/d_struct_that_implements_the_interface.go

This way, you would have two separate packages: main and my_prog_pkg.

The reason behind this requirement is that Go packages provide a way to organize and modularize code. Each package has a specific functionality and can be reused across multiple programs. By defining each package in its own directory, you ensure that the packages are isolated from each other and prevent naming conflicts.

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