Lone is a Lisp interpreter crafted in freestanding C without standard library support. The author built everything from primitives: data structures, a typed value system combining lists, vectors, and tables through unions, plus a custom language emerging organically from implementation needs rather than upfront design.

Without malloc or libc available, a custom memory allocator became essential. The implementation uses a linked list of memory descriptors tracking size, free status, and pointers. A first fit strategy searches linearly through blocks, splitting oversized chunks and marking smaller ones as allocated. Basic but functional, it served the project's needs despite obvious inefficiencies.

Deallocation simply marks blocks as free, while coalescing merges adjacent free blocks to reduce fragmentation. The allocator carries roughly 30-50% metadata overhead and suffers from poor fragmentation control, yet operated reliably for three years during language development. Performance bottlenecks include linear scanning on every allocation and accumulating small fragments near list heads.

The conservative garbage collector adds another layer of complexity, requiring tracking of every Lisp value pointer to distinguish actual references from stack noise. A naive approach would create quadratic search problems, necessitating clever data structures to maintain reasonable performance while the language continues evolving alongside its creator's understanding.