How to import your own package?

After reading https://golang.org/doc/code.html, and having a look at a few StackOverflow questions on the topic, I still can't build a program with several files in it.

My GOPATH is: C:/go_dev/, and my directory structure is:

go_dev/
    src/
        github.com/
            aurelienCastel/
                crashTest/
                    main.go
                    parser/
                        parser.go

main.go:

package main
import "github.com/aurelienCastel/crashTest/parser"
func main() {
     info := parser.get_info_from("file.go")
     // ...
}

parser/parser.go:

package parser
// ...
func get_info_from(file_name string) Info {
    // ...
}

When I run go installin the crashTestdirectory I get the following error:

> undefined: parser.get_info_from

I know this is a recurrent question, but could someone tell me what I am doing wrong?

In order for an identifier to be accessible from an outside package, its name must begin with an uppercase letter. From the spec:

> ### Exported identifiers
An identifier may be exported to permit access to it from another package. An identifier is exported if both:

> - the first character of the identifier's name is a Unicode upper case letter (Unicode class "Lu"); and

• the identifier is declared in the package block or it is a field name or method name.

> All other identifiers are not exported.

Additionally, it is Go convention to name identifiers using mixed case, rather than snake case.

package parser
// ...
func GetInfoFrom(filename string) Info {
    // ...
}