What a bizarre criticism. Most of the newer popular functional languages aren't implemented in those, but rather Java, and for the same reason given in the readme for Go.
> Most of the newer popular functional languages aren't implemented in those, but rather Java
Well, that's not entirely correct. I assume you mean they run on the JVM? Language like scala are actually written IN scala. The only thing that is in java is the interpreter but the entire compiler is scala.
> Most of the newer popular functional languages aren't implemented in those, but rather Java,
I don't think this is true. Java is not a good language for compilers in any case, and it would cause me to trust the language less, especially if they were claiming it was a "functional programming language"
Well, that's not entirely correct. I assume you mean they run on the JVM? Language like scala are actually written IN scala. The only thing that is in java is the interpreter but the entire compiler is scala.