Rust style

Apply these Rust style conventions directly. Match the project's edition, rustfmt.toml, instructions and nearby code; project-specific instructions take precedence.

rustfmt owns the layout of a line: indentation, wrapping, brace placement, trailing commas and import sorting. Run cargo fmt and never hand-format against it. rustfmt keeps blank lines but never adds them, so the rules below about whitespace are yours to apply.

File layout and imports

//! Name resolution: what a name in a statement stands for.

use std::collections::HashMap;
use std::path::Path;