Re: How to check if a proc has no return type?

[treeform]

You can use the compiles special function to do a ton of this work:

[https://play.nim-lang.org/#ix=25sG](https://play.nim-lang.org/#ix=25sG)
    
    
    proc echo2(s: string): string = ""
    
    template returnsVoid(f: untyped): bool =
      compiles:
        let v = f
    
    echo returnsVoid(echo(":)"))
    echo returnsVoid(echo2(":)"))
    
    
    Run
    
    
    false
    true
    
    
    Run