matrix-appservice-irc 0 -> 1
attrpath: matrix-appservice-irc
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/1gs7z9hqy3f2hvhbpp56zwh3mxm0j97i-packages.json.drv
building '/nix/store/1gs7z9hqy3f2hvhbpp56zwh3mxm0j97i-packages.json.drv'...

Going to be running update for following packages:
 - matrix-appservice-irc-1.0.1

Press Enter key to continue...
Running update for:
 - matrix-appservice-irc-1.0.1: UPDATING ...
 - matrix-appservice-irc-1.0.1: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/servers/matrix-synapse/matrix-appservice-irc/default.nix b/pkgs/servers/matrix-synapse/matrix-appservice-irc/default.nix
index 3d2e4058d061..32b17f93dd7e 100644
--- a/pkgs/servers/matrix-synapse/matrix-appservice-irc/default.nix
+++ b/pkgs/servers/matrix-synapse/matrix-appservice-irc/default.nix
@@ -12,13 +12,13 @@
 
 let
   pname = "matrix-appservice-irc";
-  version = "1.0.1";
+  version = "2.0.0";
 
   src = fetchFromGitHub {
     owner = "matrix-org";
     repo = pname;
     rev = "refs/tags/${version}";
-    hash = "sha256-wUbWvCa9xvot73nXZjF3/RawM98ffBCW5YR2+ZKzmEo=";
+    hash = "sha256-voZJVBggsuwmGw/imt2HYmqiYBkRYMpppt/Nemh6fsM=";
   };
 
   yarnOfflineCache = fetchYarnDeps {

No auto update branch exists
Received ExitFailure 1 when running
Raw command: /nix/store/v7gdmdc9yhx3ngh840xx5kr46840s73b-nix-2.18.2/bin/nix-build --option sandbox true --arg config "{ allowBroken = true; allowUnfree = true; allowAliases = false; }" --arg overlays "[ ]" -A matrix-appservice-irc
Received ExitFailure 1 when running
Raw command: /nix/store/v7gdmdc9yhx3ngh840xx5kr46840s73b-nix-2.18.2/bin/nix --extra-experimental-features nix-command log -f . matrix-appservice-irc
Standard output:

error: build log of 'matrix-appservice-irc' is not available