Ah, that's a part of Lazarus (the "pas" at the end is a giveaway). Actually I've had this idea for some time that integrating Go into Lazarus might be worthwhile - I was a Delphi developer before I "jumped ship" to web development, but I still like the effortless way of building GUI applications with a proper GUI design tool, and Go's speed of compilation and some syntax elements make it appealing for Pascal developers (at least that's the way I felt when I first tried it). But not sure how the two communities would feel about this idea...