Beginning scanning:

Total valid tokens: 5
Token 0: begin, content: begin
Token 1: left, content: left
Token 2: intlit, content: 104
Token 3: right, content: right
Token 4: identifier, content: foo
Token 5: begin, content: begin
Token 6: strlit, content: "this is some text"
Token 7: end, content: end
---end of tokens---