From 956c6de476a039268c8f4477109d0336c8a35684 Mon Sep 17 00:00:00 2001
From: Daniel Beckwith <djbsnx@gmail.com>
Date: Sun, 5 Mar 2023 10:10:31 -0500
Subject: [PATCH] handle semver-only package version in fromManifestFile

---
 rust-overlay.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rust-overlay.nix b/rust-overlay.nix
index fb862ec..46543b7 100644
--- a/rust-overlay.nix
+++ b/rust-overlay.nix
@@ -270,7 +270,10 @@ let
       makeOverridable ({extensions, targets, targetExtensions}:
         let
           version' = builtins.match "([^ ]*) [(]([^ ]*) ([^ ]*)[)]" pkg.version;
-          version = "${elemAt version' 0}-${elemAt version' 2}-${elemAt version' 1}";
+          version =
+            if version' == null
+            then pkg.version
+            else "${elemAt version' 0}-${elemAt version' 2}-${elemAt version' 1}";
           namesAndSrcs = getComponents pkgs.pkg name targets extensions targetExtensions stdenv fetchurl;
           components = installComponents stdenv namesAndSrcs;
           componentsOuts = builtins.map (comp: (super.lib.strings.escapeNixString (super.lib.getOutput "out" comp))) components;