#22500 reorganize rust sources to have `src/rust` be the workspace root Issue created by tdyas Currently, the

engine

crate is both the primary crate in Pants and also the root of the Rust workspace. I'd like to reorganize the Rust sources to break that conjunction.

src/rust

would become the new workspace root. All crates one level below

engine

would be moved to

src/rust

. For example,

src/rust/engine/process_execution

becomes

src/rust/process_execution

. The crates underneath

process_execution

(like

src/rust/engine/process_execution/remote

) would still live under

src/rust/process_execution

since they are arguably thematically related.

src/rust/engine/Cargo.toml

would be split into the workspace-specific part and the

engine

-specific part. Currently, it serves dual purposes. Benefits: 1. Easier to understand

engine

since its top-level directory is not polluted with every other crate. 2. The workspace

Cargo.toml

will be separate from the

engine

Cargo.toml

. It will make it easier for readers to reason about the workspace and

engine

. pantsbuild/pants