According to a post from a few years ago, they were using &quot;Go programming&quot;, &quot;Google Go&quot;, and &quot;golang&quot;[1].<p>You&#x27;d have a similar problem with Rust, Ruby, Python, Java, Ada, Julia, and probably tons of other languages. It must also be really difficult to differentiate between C, C#, and C++, considering most search algorithms will ignore the # and + characters.<p>1. <a href="https:&#x2F;&#x2F;groups.google.com&#x2F;d&#x2F;msg&#x2F;golang-nuts&#x2F;TtPzOvhG6bM&#x2F;-XCrqjfQ4ScJ" rel="nofollow">https:&#x2F;&#x2F;groups.google.com&#x2F;d&#x2F;msg&#x2F;golang-nuts&#x2F;TtPzOvhG6bM&#x2F;-XCr...</a>