template withOpenFile(f: expr, filename: string, mode: TFileMode,
                      actions: stmt): stmt =
  block:
    var f: TFile
    if open(f, filename, mode):
      try:
        actions
      finally:
        close(f)
    else:
      quit("cannot open for writing: " & filename)
    
withOpenFile(txt, "ttempl3.txt", fmWrite):
  writeln(txt, "line 1")
  txt.writeln("line 2")
  
# Test zero argument template: 
template ha: expr = myVar[0]
  
var
  myVar: array[0..1, int]
  
ha = 1  
echo(ha)


# Test identifier generation:
template prefix(name: expr): expr = `"hu" name`

var `hu "XYZ"` = "yay"

echo prefix(XYZ)

template typedef(name: expr, typ: typeDesc) = 
  type
    `T name`* = typ
    `P name`* = ref `T name`
    
typedef(myint, int)
var x: PMyInt