From fbef9e09160f01b4630a97b20b184343c6ffdb03 Mon Sep 17 00:00:00 2001
From: Yuval Kogman <nothingmuch@woobling.org>
Date: Thu, 25 May 2023 22:31:35 +0300
Subject: [PATCH] Add rust-src toolchain component

Provides sources of standard library, e.g. for rust-analyzer.
---
 rust/flake.nix | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/rust/flake.nix b/rust/flake.nix
index bbc2371..ea71a22 100644
--- a/rust/flake.nix
+++ b/rust/flake.nix
@@ -22,13 +22,17 @@
           rustToolchain =
             let
               rust = super.rust-bin;
+              toolchain =
+                if builtins.pathExists ./rust-toolchain.toml then
+                  rust.fromRustupToolchainFile ./rust-toolchain.toml
+                else if builtins.pathExists ./rust-toolchain then
+                  rust.fromRustupToolchainFile ./rust-toolchain
+                else
+                  rust.stable.latest.default;
             in
-            if builtins.pathExists ./rust-toolchain.toml then
-              rust.fromRustupToolchainFile ./rust-toolchain.toml
-            else if builtins.pathExists ./rust-toolchain then
-              rust.fromRustupToolchainFile ./rust-toolchain
-            else
-              rust.stable.latest.default;
+            toolchain.override {
+              extensions = [ "rust-src" ]; # https://github.com/the-nix-way/dev-templates/issues/4
+            };
         })
       ];