untyped_const_default_type.go

package main

import "fmt"

func main() {
    // has default type of float
    const Tau = 3.14 * 2

    // implicitly converted to a float64, 
    // because of the assignment to a "runtime" variable 
    // so, a type is needed for this "context"
    pi := Tau / 2

    fmt.Printf("pi: %f\n", pi)
}