doc/spec: Package initialization order: initialized order d b c a, real result is d c b a

[terryding77]

go/doc/go_spec.html

Line 6452 in 049c8db

the initialization order is <code>d</code>, <code>b</code>, <code>c</code>, <code>a</code>.

the code as spec#Package_initializationthe

package main

import "fmt"

var (
    a = c + b
    b = f()
    c = f()
    d = 3
)

func f() int {
    d++
    return d
}

func main() {
    fmt.Println("a", a)
    fmt.Println("b", b)
    fmt.Println("c", c)
    fmt.Println("d", d)
}

got

result:
a 9
b 5
c 4
d 5

but with the order in spec d-> b -> c -> a, I think the expect result shoud be

a 9
b 4
c 5
d 5

if I change a = c + b to a = b + c the order is same as spec init order d b c a
so is there something wrong?

my go version is go version go1.12.4 linux/amd64

[randall77]

I agree.
It seems very odd that this bug is here. This exact example is in the spec. There should be a test!

The gc toolchain has had this bug since at least 1.2.
The gccgo toolchain (7.3.0, at least) gets it right!

[dmitshur]

I think this is the same as issue #22326.

[dmitshur]

@terryding77 Thanks for reporting. I'll close this as duplicate.

@randall77 Feel free to apply release-blocker label to the other issue too, if you think it still applies.