So you want to design a programming language (2017)
One of the sections in the article is headed "study existing languages", but why not also study languages that shaped programming language history? No mention of the Pascal-family of languages (Pascal, Modula-2, Oberon), no mention of Ada. Even Algol 68 is full of ideas that would reward study.<p>Also, the language descriptions are too brief to be helpful (<i>Java and C# for being enterprisey</i>, <i>C++ and Rust for pointers and other system constructs</i>)