Doesn't recognize Octal numbers that don't contain an `o`

[notJoon]

Description

There are two ways to represent octal numbers in Go: as a nunber, like 012345, and by typing the letter o to indicate that value is an octal, like 0o12345.

However, gnolang only recognizes the latter case.

For example:

package main

import "fmt"

func main() {
    octval := 0o12345
    fmt.Println(octval)
}

// Output:
// 5349

In this case, it recognizes the 0o12345 as octal well and prints the result 5349. But, if changes the code like below, It throws an error.

package main

import "fmt"

func main() {
    octval := 012345. // No `o`
    fmt.Println(octval)
}

// error: invalid integer constant: 012345
// Must print 5349

expected behavior:

My guess is that this problem will be fixed by modifying the scanner file or op_eval.

[thehowl]

My guess is that this problem will be fixed by modifying the scanner file or op_eval.

Yes, if you want to take a stab at it, I suggest changing this part of op_eval and making it treat x.Values that start with 0 to be octals.