Types are incorrect when omitting the value while ranging over a slice

[m90]

This is picking up: https://github.com/Microsoft/vscode-go/issues/1242

I found an issue in godef where the first argument when ranging over a slice will be incorrect when you omit the value (i.e. use the index only).

Consider the following program:

package main

import (
	"fmt"
)

func main() {
	s := []string{"a", "b", "c"}
	for index, char := range s {
		fmt.Println(index, char)
	}
	for index := range s {
		fmt.Println(index)
	}
}

I will get int, string for the first loop, but bool for the second one:

frederik@fr-xps:~/projects/go/src/github.com/m90/test$ cat main.go 
package main

import (
	"fmt"
)

func main() {
	s := []string{"a", "b", "c"}
	for index, char := range s {
		fmt.Println(index, char)
	}
	for index := range s {
		fmt.Println(index)
	}
}

frederik@fr-xps:~/projects/go/src/github.com/m90/test$ godef -o 84 -f main.go -t
main.go:9:6
index int
frederik@fr-xps:~/projects/go/src/github.com/m90/test$ godef -o 89 -f main.go -t
main.go:9:13
char string
frederik@fr-xps:~/projects/go/src/github.com/m90/test$ godef -o 144 -f main.go -t
main.go:12:6
index bool