test if highlight is loaded before use
test if highlight is loaded before use

Microsoft/pxt,switch-education/pxt,Microsoft/pxt,switchinnovations/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,playi/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,switchinnovations/pxt