Only check for already loaded indirect dependencies in existing_match For direct dependencies it is a lot harder to not accidentally resolve an ambiguity through an indirect dependency edge and as it turns out this check was actually more expensive than the work it skipped. For indirect dependencies existing_match is still necessary due to an assert in load, but at the same time it also can't accidentally resolve an ambiguity given that we already know exactly which crate to look for based on the crate hash.
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This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrated with other languages.
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Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).
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