Rust would certainly not have existed in it's current form without Haskell. There are many such “progenitor languages” that focus primarily on theoretical eleg

Rust would certainly not have existed in it's current form without Haskell. There are many such “progenitor languages” that focus primarily on theoretical elegance such as Smalltalk, Scheme, and Haskell that might not see huge adoption but do inspire a rather lasting influence on many languages that grew far larger than they.