A blog post exploring how Gleam's compiler checks case expression exhaustiveness, walking through compiler-core/src/exhaustiveness.rs to explain how the compiler verifies that all possible pattern values are covered (and detects unreachable clauses). The author uses an everyday decision-making analogy to introduce the concept before diving into a simple Bool pattern-matching example.
Background
Gleam is a functional programming language designed to run on the Erlang VM, known for strong type safety and pattern matching. Case exhaustiveness checking is a compiler feature that ensures all possible values of a type are handled in pattern matching expressions.
- Source
- Lobsters
- Published
- Oct 16, 2026 at 03:33 AM
- Score
- 5.0 / 10