Fuse – statically typed functional programming language
Hi HN! I've been working on the fuse programming language, it's a statically typed purely functional language with higher-kinder types and ad-hoc polymorphism. It compiles to the GRIN whole-program optimizer, producing LLVM-generated native code. Fuse supports ADTs, Generics, Type Methods, Traits, Pattern matching etc. all in a functional style with no mutations. I’ve been developing the language for 5 years, with code written in Scala. I’ve started coding the language from the base of System F that was implemented as part of the book: Types and Programming Languages (tapl). And then…
In plain words
Fuse is a statically typed purely functional programming language that eliminates mutations while supporting algebraic data types, generics, traits, and pattern matching. It compiles to LLVM-generated native code through the GRIN whole-program optimizer. Designed for developers seeking functional programming paradigms combined with practical features inspired by Rust, Haskell, and Scala, Fuse offers higher-kinded types and bidirectional type checking with higher-rank polymorphism.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN! I've been working on the fuse programming language, it's a statically typed purely functional language with higher-kinder types and ad-hoc polymorphism. It compiles to the GRIN whole-program optimizer, producing LLVM-generated native code. Fuse supports ADTs, Generics, Type Methods, Traits, Pattern matching etc. all in a functional style with no mutations. I’ve been developing the language for 5 years, with code written in Scala. I’ve started coding the language from the base of System F that was implemented as part of the book: Types and Programming Languages (tapl). And then extending with concepts such as Bidirectional Type Checking with Higher-Rank Polymorphism. I’ve mainly drawn inspiration from Rust, Haskell, Scala and Python (in terms of syntax). It all started because I wanted a language that has Rust-like concepts such as: ADT, Traits, Impl block syntax, etc. but have the pure functional semantics. I'd would love feedback on the language design and its general usage.
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