Extend section on constants to include functions and structs.
Extend section on constants to include functions and structs.

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