tour: Empty comment line needed to get code to run

[z-bowen]

The code in this exercise fails to run as initially presented. However, by adding a blank comment line at the beginning of the main function, the problem is fixed.

I'm running Chrome v66 on a MacBook with High Sierra.

Working

Not Working

Context: https://tour.golang.org/moretypes/13

Change the title above to describe your issue and add your feedback here, including code if necessary

[bgadrian]

I can confirm, probably some unwanted unicode characters were added

The page event looks broken (see white box).

The content of the page code (without pressing/clicking) is
curl 'https://tour.golang.org/compile' -H 'cookie: ' -H 'origin: https://tour.golang.org' -H 'accept-encoding: gzip, deflate, br' -H 'accept-language: en-GB,en;q=0.9,en-US;q=0.8,ro;q=0.7' -H 'x-requested-with: XMLHttpRequest' -H 'pragma: no-cache' -H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36' -H 'content-type: application/x-www-form-urlencoded; charset=UTF-8' -H 'accept: application/json, text/javascript, */*; q=0.01' -H 'cache-control: no-cache' -H 'authority: tour.golang.org' -H 'referer: https://tour.golang.org/moretypes/13' -H 'dnt: 1' --data 'version=2&body=package+main%0A%0Aimport+%22fmt%22%0A%0Afunc+main()+%7B%0A%09a+%3A%3D+make(%5B%5Dint%2C+5)%0A%09printSlice(%22a%22%2C+a)%0A%0A%09b+%3A%3D+make(%5B%5Dint%2C+0%2C+5)%0A%09printSlice(%22b%22%2C+b)%0A%0A%09c+%3A%3D+b%5B%3A2%5D%0A%09printSlice(%22c%22%2C+c)%0A%0A%09d+%3A%3D+c%5B2%3A5%5D%0A%09printSlice(%22d%22%2C+d)%0A%7D%0A%0Afunc+printSlice(s+string%2C+x+%5B%5Dint)+%7B%0A%09fmt.Printf(%22%25s+len%3D%25d+cap%3D%25d+%25v%5Cn%22%2C%0A%09%09s%2C+len(x)%2C+cap(x)%2C+x)%0A%7D%0A' --compressed

[bgadrian]

After some more investigations I think it may be related to #505 and #512

Some invisible runes seems link all these issues (errors and UI).