It's easy to show that you're right and that code isn't dead so it can't be eliminated:

    package main
    
    import (
     "fmt"
    
     "github.com/vvvvv/dlg"
    )
    
    func risky() error {
     _, err := fmt.Printf("unexpected error\n")
     return err
    }
    
    func main() {
     dlg.Printf("something failed: %s", risky())
     risky()
    }

prints "unexpected error" twice