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It's the same with other languages as well: Go, Julia, Ruby (when I searched for some "Ruby Bangkok" meetups, I found thousands of offers to buy real rubies in Thailand. Same with frameworks: Phoenix, Sinatra, Iron, Gin.

After some time Google learns and shows you relevant results, but if you use Startpage or DuckDuckGo, you have to add "lang" or "framework" to search query

C is by far the worst...

Side Note: In DDG Lua doesn't need 'lang', you can type in a function name and it'll give you documentation in the 'instant answers' thing.

Google seems to know that when I am searching for ruby, I want it to rank the programming language first. In due time it will know that by crystal I mean the programming language.

I agree, but I note some of this is out of your control. Rust used to be very clean wrt Google, and then Rust the game was released in 2014.

You can use #crystallang

Search for "crystal language" instead.