Package visibility
Regardless of the number of source files declared to be part of a package, all source code elements (types, variables, constants, and functions), declared at a package level, share a common scope. Therefore, the compiler will not allow an element identifier to be re-declared more than once in the entire package. Let us use the following code snippets to illustrate this point, assuming both source files are part of the same package $GOPATH/src/foo:
package foo
var (
bar int = 12
)
func qux () {
bar += bar
}
foo/file1.go |
package foo
var bar struct{
x, y int
}
func quux() {
bar = bar * bar
}
foo/file2.go |
Illegal variable identifier re-declaration
Although they are in two separate files, the declaration of variables with identifier bar is illegal in Go. Since the files are part of the same package, both identifiers have...
