Type Alias PlaygroundMark

What a link can point at, written the way flowR names a place in a script:

• 12 is the whole line, 12-15 the lines from 12 to 15
• 12@sum is the name sum on line 12, 12:5 whatever starts at that column
• lint:<rule> is everything a linting rule reported, lint:<rule>@12 its finding on that line
• dep:<kind> is what the dependency query found of that kind, dep:<kind>@12 the one on that line
• a PlaygroundBox is one of the boxes of the page itself