Each line you enter will be parsed into tokens.

> :a
Op(:)
Id(a)
EndMarker()

> -a
Op(-)
Id(a)
EndMarker()

> <a
Op(<)
Id(a)
EndMarker()

> >a
Op(>)
Id(a)
EndMarker()

> foo
Id(foo)
EndMarker()

> foo_bar
Id(foo_bar)
EndMarker()

> bar_
Id(bar_)
EndMarker()

> 1.2
Real(1.2)
EndMarker()

> 2E10
Real(2e10)
EndMarker()

> 2e5
Real(200000)
EndMarker()

> 3E-9
Real(3e-9)
EndMarker()

> 3.4E5
Real(340000)
EndMarker()

> 5.6e-7
Real(5.6e-7)
EndMarker()

> 1.
Real(1)
EndMarker()

> 2.e2
Real(200)
EndMarker()

> .123
Real(0.123)
EndMarker()

> .123e2
Real(12.3)
EndMarker()

> 0000.123
Real(0.123)
EndMarker()

> (* comment *)
Comment((* comment *))
EndMarker()

> (* (* nested *) comment *)
Comment((* (* nested *) comment *))
EndMarker()

> "Text Literal"
Text("Text Literal")
EndMarker()

> "Hello, World!\n"
Text("Hello, World!\n")
EndMarker()

> "Escape characters: \n\f\t\r\"\000\001\002"
Text("Escape characters: \n\f\t\r\"\000\001\002")
EndMarker()

> ^D