I don't know how you got "invalid indentation". Even pressing the "Run" button 
on the forum gives a different error. This is the correct version:
    
    
    #? stdtmpl | standard
    #proc greet(name = "world"): string =
    # result = ""
    <h1>Hello $name</h1>
    #end proc
    #
    #echo greet()
    

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