Fungi is a Rust-based DSL that offers a typed functional language for incremental computation with names.
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(See also: Fungi technical report)
Fungi is a typed functional language for incremental computation with names.
Incremental computations attempt to exploit input similarities over time, reusing work that is unaffected by input changes. To maximize this reuse in a general-purpose programming setting, programmers need a mechanism to identify dynamic allocations (of data and subcomputations) that correspond over time. Fungi offers a notion of names, which is formal, general, and statically verifiable.
Fungi's type-and-effect system permits the programmer to encode (program-specific) local invariants about names, and to use these invariants to establish global uniqueness for their composed programs, the property of using names correctly. We prove (on paper) that well-typed Fungi programs respect global uniqueness. We implement Fungi in Rust, as a "deeply-embedded" language, including Fungi's bidirectional type system and incremental evaluation semantics.