JuniorTheoryCommon

What happens when this program is built and run?

package main

import "fmt"

func main() {
    s := "go"
    s[0] = 'G'
    fmt.Println(s)
}

It does not compile

Expecting Go, as if a string were a byte array you can edit: Go strings are immutable, so s[0] = 'G' is rejected with cannot assign to s[0].
Expecting a panic at run time: the compiler already knows s is a string, so the error stops the build and the program never starts.

JuniorTheoryCommon

package main

import "fmt"

func main() {
    s := "go"
    s[0] = 'G'
    fmt.Println(s)
}

It does not compile

Expecting Go, as if a string were a byte array you can edit: Go strings are immutable, so s[0] = 'G' is rejected with cannot assign to s[0].
Expecting a panic at run time: the compiler already knows s is a string, so the error stops the build and the program never starts.