Module layout 

Layout invariants — the Rust-enforced package structure.

This is the caixa analog of Cargo’s implicit src/lib.rs vs src/main.rs rule: the Rust type system dictates the package shape, and the invariant checker runs before any build step. StandardLayout encodes the canonical layout:

• caixa.lisp — always required
• lib/<nome>.lisp — required when :kind Biblioteca and :bibliotecas is empty
• each :bibliotecas — must resolve on disk
• each :exe — must resolve on disk, under exe/
• each :servicos — must resolve on disk, under servicos/

Filesystem I/O is injected through StandardLayout::with_path_exists so tests can run without touching disk.

Structs

StandardLayout

The default layout contract.

Enums

LayoutError

Traits

LayoutInvariants

Contract — a caixa layout checker.