From 9daae17b8eaf24a7eeb89c040c9a221ea90a415d Mon Sep 17 00:00:00 2001
From: Eliza Weisman <eliza@elizas.website>
Date: Thu, 8 Feb 2024 15:45:59 -0800
Subject: [PATCH] [nix flake] add `rust-src` component

Currently, when using the Nix flake managed Rust toolchain,
`rust-analyzer` complains that it can't expand proc macros, because it
can't find the sysroot. Adding the `rust-src` Rustup component fixes
this. This PR adds the `rust-src` component to the flake's Rust
toolchain.
---
 flake.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index 408dff5706..8897d9428d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,7 +17,11 @@
         system = "x86_64-linux";
       };
       # use the Rust toolchain defined in the `rust-toolchain.toml` file.
-      rustToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+      rustToolchain = (pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml).override {
+        extensions = [
+          "rust-src" # for rust-analyzer
+        ];
+      };
 
       buildInputs = with pkgs; [
         # libs