Why Does My Go Program Fail with 'found packages my_prog and main,' and How Can I Fix It?

Package Import Error in Go: Resolving "found packages my_prog and main"

When attempting to build a Go program, a common error that developers encounter is "can't load package: package my_prog: found packages my_prog and main." This error indicates a conflict with multiple packages sharing the same name.

To resolve this error, the following understanding is crucial:

Package Structure in Go

In Go, code is organized into packages. A package defines a set of related types, functions, and variables. Each package must reside in its own directory.

Package Import and Conflicts

When you import a package in Go, you specify its name as an identifier in the import statement. If there are multiple packages with the same name in the current directory or in the GOPATH, Go will throw an import conflict error.

Case in Question

Based on the provided code structure, you have two packages in the same directory:

• main: Defined in main.go
• my_prog: Defined in d_interface.go and d_struct_that_implements_the_interface.go

Go's import mechanism is case-sensitive, meaning that main and my_prog are considered distinct packages. However, when you try to build my_prog, Go finds both packages in the current directory and raises the import conflict error.

Solution

To resolve this error, you need to ensure that each package resides in its own directory:

• Move the files d_interface.go and d_struct_that_implements_the_interface.go to a separate directory.
• Rename the new directory to my_prog.
• Update the import statement in main.go to reflect the new directory name.

Once you make these changes, you should be able to successfully build the my_prog package.

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