找到包但找不到内容？

I get a strange error while building my go project.

My structure:

-$GOPATH
 -src
   -main
     -main.go
   -configuration
     -configuration.go

configuration.go:

package configuration;

type Config int;

func (c Config) Parse(s string) map[string]string {...}

main.go

package main;

import"configuration"

func main() {
    var config Config;
    argMap := config.parse(...);    
    return;
}

if my working directory is $GOPATH, I do:

go build configuration - no output, OK
go build main
    imported and not used "configuration"
    undefined: Config

So my package is found ($GOPATH/pkg contains configuration.go with correct content - I can see the Parse method) and main imports it, but does not recognize its contents?

I recon the problem is that the type Config is not exported? Why would that be?

argMap := config.parse(...); wouldn't work, since you declared a Parse() method.
(as in "exported method configuration.Parse()")

var config configuration.Config
argMap := config.Parse(...); 

Config is exported, but the methods are case-sensitive (cf. Exported Identifiers).

You are trying to use Config from package main, where it is not defined, instead of the one from configuration (thats the error "imported and not used"):

package main

import "configuration"

func main() {
    var config configuration.Config
    argMap := config.Parse(...)
}

The second problem is calling unexported parse instead of Parse as explained by VonC.