add logging when detecting uncompilable code
add logging when detecting uncompilable code

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