Use nix::Result explicitly.
Use nix::Result explicitly.

posborne/rust-nix,nix-rust/nix,berkowski/nix,asomers/nix,posborne/rust-nix,asomers/nix,posborne/rust-nix,berkowski/nix,xd009642/nix,nikklassen/nix-rust,berkowski/nix,Susurrus/nix,Susurrus/nix,kamalmarhubi/nix-rust,geofft/nix-rust,xd009642/nix,geofft/nix-rust,geofft/nix-rust,MarkusJais/nix-rust,carllerche/nix-rust,nix-rust/nix,MarkusJais/nix-rust,carllerche/nix-rust,nikklassen/nix-rust,xd009642/nix,nikklassen/nix-rust,Susurrus/nix,carllerche/nix-rust,MarkusJais/nix-rust,kamalmarhubi/nix-rust,kamalmarhubi/nix-rust