Syntax Error: Non-declaration statement outside function body - function

Question

The function makeEvenGenerator is supposed to return a function that generates even numbers in a sequential manner:
package main
import "fmt"
func makeEvenGenerator() func() uint {
i := uint(0)
return func() (ret uint) {
ret = i
i += 2
return
}
}func main() {
nextEven := makeEvenGenerator()
fmt.Println(nextEven()) // 0
fmt.Println(nextEven()) // 2
fmt.Println(nextEven()) // 4
}
When I run it, I get the error syntax error: unexpected func, expecting semicolon or newline and Non-declaration statement outside function body.
The code is taken verbatim from An Introduction to Programming in Go by Caleb Doxsey. I am not sure what the problem is.

Answer 1

You are missing a newline between the "}" at the end of the makeEvenGenerator and the "func" in main.
I fixed the error and posted the code to the playground.

Answer 2

There are rules about semicolons.
The Go Programming Language Specification
Semicolons
The formal grammar uses semicolons ";" as terminators in a number of
productions. Go programs may omit most of these semicolons using the
following two rules:
When the input is broken into tokens, a semicolon is automatically inserted into the token stream at the end of a non-blank line if the
line's final token is
an identifier
an integer, floating-point, imaginary, rune, or string literal
one of the keywords break, continue, fallthrough, or return
one of the operators and delimiters ++, --, ), ], or }
To allow complex statements to occupy a single line, a semicolon may be omitted before a closing ")" or "}".
The error is here,
}func main() {
Write,
}
func main() {

Answer 3

You were missing a new line between } at the end of makeEvenGenerator and func main.
Also an alternative approach for that pattern is to use a channel not return a function:
func evenGenerator() <-chan uint {
ch := make(chan uint)
go func() {
i := uint(0)
for {
ch <- i
i += 2
}
}()
return ch
}
func main() {
evens := evenGenerator()
for i := 0; i < 3; i++ {
fmt.Println(<-evens)
}
}
playground