'<stream start>'
block-mapping-start-token()
'?'
scalar-token(plain=#t, style=#f, value="null")
':'
'?'
scalar-token(plain=#t, style=#f, value="booleans")
':'
'['
scalar-token(plain=#t, style=#f, value="true")
','
scalar-token(plain=#t, style=#f, value="false")
']'
'?'
scalar-token(plain=#t, style=#f, value="string")
':'
scalar-token(plain=#f, style=#\', value="012345")
block-end-token()
'<stream end>'