put [at 4:1]
 arg: myvar
 arg: {Hello world!
}
print [at 7:1]
 arg: myvar
print [at 11:1]
 arg: {Hello universe! }
 arg: myvar
put [at 15:1]
 arg: str
 arg: {cats raining from the sky}
put [at 16:1]
 arg: tmp
 arg: str
print [at 17:1]
 arg: str
 arg: {==}
 arg: tmp
 arg: {
}
print [at 21:1]
 arg: {safe get: '}
 arg: ?nonexist
 arg: {'
}
print [at 25:1]
 arg: {exists (no):  }
 arg: &nonexist
 arg: {
}
print [at 26:1]
 arg: {exists (yes): }
 arg: &myvar
 arg: {
}
