let var1 = 3;
mutable var2 = 5L;
set var2 = var2 + 1.5;
----------------------------------------------------
[
["keyword", "let"],
" var1 ",
["operator", "="],
["number", "3"],
["punctuation", ";"],
["keyword", "mutable"],
" var2 ",
["operator", "="],
["number", "5L"],
["punctuation", ";"],
["keyword", "set"],
" var2 ",
["operator", "="],
" var2 ",
["operator", "+"],
["number", "1.5"],
["punctuation", ";"]
]
----------------------------------------------------
Checks for variable assignment and numbers