LET "let" (1, 1)
ID "greeting" (2, 3)
= "=" (2, 12)
" "\"" (2, 14)
STR "Hello World!" (2, 15)
" "\"" (2, 27)
; ";" (2, 28)
IN "in" (3, 1)
ID "greeting" (4, 3)