Anonymous structs outside function not working [closed] - function

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I don't understand why this doesn't work for this type of structure.
package main
import (
"fmt"
)
var myStruct struct {
number float64
word string
toggle bool
}
myStruct.number = 3.14
myStruct.word = "pie"
myStruct.toggle = true
func main() {
//myStruct.number = 3.14
//myStruct.word = "pie"
//myStruct.toggle = true
fmt.Println(myStruct.number)
fmt.Println(myStruct.toggle)
fmt.Println(myStruct.word)
}
If I try to change myStruct.number outside main, I get a compilation error syntax error: non-declaration statement outside function body, but it works fine inside the function. With variables or other types of data structures, it works fine to change values outside main scope, but not with struct.
The program is an example from Head first Go, and even if I searched at least three more books and google for more information, I haven't found something similar that would be better explained.

Answer 1

https://play.golang.org/p/brocZzWuRae
package main
import (
"fmt"
)
var myStruct = struct {
number float64
word string
toggle bool
}{
number: 3.14,
word: "pie",
toggle: true,
}
func main() {
//myStruct.number = 3.14
//myStruct.word = "pie"
//myStruct.toggle = true
fmt.Println(myStruct.number)
fmt.Println(myStruct.toggle)
fmt.Println(myStruct.word)
}