jdreaver

    $ perf record -g -F 99 ./my-program
    $ perf script report flamegraph

    package main

    import "fmt"

    func main() {
        closure := make_closure()
        fmt.Println("closure():", closure())
    }

    func make_closure() func() int {
        x := 1
        return func() int { return x }
    }

    $ go run main.go
    closure(): 1