Yes I see this as well

━ Dependency Graph:
┃                               ┌─ ⏵ eldoc-1.16.0.tar ⏱ 25s
┃                            ┌─ ⏸ emacs-eldoc-1.16.0
┃                            ├─ ⏵ flymake-1.4.1.tar ⏱ 24s
┃                         ┌─ ⏸ emacs-flymake-1.4.1
┃                         │  ┌─ ⏵ compat-30.1.0.1.tar ⏱ 25s
┃                         ├─ ⏸ emacs-compat-30.1.0.1
┃                      ┌─ ⏸ emacs-eglot-1.18
┃                   ┌─ ⏸ emacs-flycheck-eglot-20250626.212
┃                   │  ┌─ ⏵ beancount-0.9.0.tar ⏱ 26s
┃                   ├─ ⏸ emacs-beancount-0.9.0
┃                   │  ┌─ ⏵ nov.el-933816c ⏱ 30s
┃                   ├─ ⏸ emacs-nov-20250615.1051
┃                   │  ┌─ ⏵ nongnu-9ee5a76 ⏱ 30s
┃                   ├─ ⏸ emacs-ws-butler-20250310.205
┃                   │  ┌─ ⏵ aspell-0.60.8.1 (configurePhase) ⏱ 40s
┃                   ├─ ⏸ aspell-env
┃                   │  ┌─ ⏵ cmake-2a2c2e0 ⏱ 56s
┃                   ├─ ⏸ emacs-cmake-mode-20250805.1455
┃                ┌─ ⏸ emacs-default-0.1.0
┃             ┌─ ⏸ emacs-packages-deps
┃          ┌─ ⏸ emacs-with-packages-30.2
┃       ┌─ ⏸ home-manager-path
┃    ┌─ ⏸ user-environment
┃ ┌─ ⏸ etc
┃ ⏸ darwin-system-25.11.830b3f0
┣━━━ Builds             │ Downloads
┗━ ∑ ⏵ 8 │ ✔ 71 │ ⏸ 434 │ ↓ 0 │ ↓ 0 │ ⏸ 956 │ ⏱ 1m28s^C

nom --version                                                                                       …/config [$!] via ❄️  impure (mwb-snowfall-env) took 1m28s ❌
nix-output-monitor 2.1.6
nix (Nix) 2.31.1

I am encountering the following build failure on nixos-unstable:

Building library for nix-output-monitor-2.1.6...
[ 1 of 25] Compiling Data.Sequence.Strict ( lib/Data/Sequence/Strict.hs, dist/build/Data/Sequence/Strict.o, dist/build/Data/Sequence/Strict.dyn_o )
[ 2 of 25] Compiling NOM.Builds       ( lib/NOM/Builds.hs, dist/build/NOM/Builds.o, dist/build/NOM/Builds.dyn_o )
[ 3 of 25] Compiling NOM.Error        ( lib/NOM/Error.hs, dist/build/NOM/Error.o, dist/build/NOM/Error.dyn_o )
[ 4 of 25] Compiling NOM.NixMessage.JSON ( lib/NOM/NixMessage/JSON.hs, dist/build/NOM/NixMessage/JSON.o, dist/build/NOM/NixMessage/JSON.dyn_o )
[ 5 of 25] Compiling NOM.NixMessage.OldStyle ( lib/NOM/NixMessage/OldStyle.hs, dist/build/NOM/NixMessage/OldStyle.o, dist/build/NOM/NixMessage/OldStyle.dyn_o )
[ 6 of 25] Compiling NOM.Parser       ( lib/NOM/Parser.hs, dist/build/NOM/Parser.o, dist/build/NOM/Parser.dyn_o )
[ 7 of 25] Compiling NOM.Parser.JSON  ( lib/NOM/Parser/JSON.hs, dist/build/NOM/Parser/JSON.o, dist/build/NOM/Parser/JSON.dyn_o )
[ 8 of 25] Compiling NOM.Print.Table  ( lib/NOM/Print/Table.hs, dist/build/NOM/Print/Table.o, dist/build/NOM/Print/Table.dyn_o )
[ 9 of 25] Compiling NOM.Print.Tree   ( lib/NOM/Print/Tree.hs, dist/build/NOM/Print/Tree.o, dist/build/NOM/Print/Tree.dyn_o )
[10 of 25] Compiling NOM.State.CacheId ( lib/NOM/State/CacheId.hs, dist/build/NOM/State/CacheId.o, dist/build/NOM/State/CacheId.dyn_o )
[11 of 25] Compiling NOM.State.CacheId.Set ( lib/NOM/State/CacheId/Set.hs, dist/build/NOM/State/CacheId/Set.o, dist/build/NOM/State/CacheId/Set.dyn_o )
[12 of 25] Compiling NOM.State.CacheId.Map ( lib/NOM/State/CacheId/Map.hs, dist/build/NOM/State/CacheId/Map.o, dist/build/NOM/State/CacheId/Map.dyn_o )
[13 of 25] Compiling NOM.State.Tree   ( lib/NOM/State/Tree.hs, dist/build/NOM/State/Tree.o, dist/build/NOM/State/Tree.dyn_o )
[14 of 25] Compiling NOM.StreamParser ( lib/NOM/StreamParser.hs, dist/build/NOM/StreamParser.o, dist/build/NOM/StreamParser.dyn_o )
[15 of 25] Compiling NOM.Update.Monad.CacheBuildReports ( lib/NOM/Update/Monad/CacheBuildReports.hs, dist/build/NOM/Update/Monad/CacheBuildReports.o, dist/build/NOM/Update/Monad/CacheBuildReports.dyn_o )
[16 of 25] Compiling NOM.Update.Monad ( lib/NOM/Update/Monad.hs, dist/build/NOM/Update/Monad.o, dist/build/NOM/Update/Monad.dyn_o )
[17 of 25] Compiling NOM.Util         ( lib/NOM/Util.hs, dist/build/NOM/Util.o, dist/build/NOM/Util.dyn_o )
[18 of 25] Compiling NOM.State        ( lib/NOM/State.hs, dist/build/NOM/State.o, dist/build/NOM/State.dyn_o )
[19 of 25] Compiling NOM.State.Sorting ( lib/NOM/State/Sorting.hs, dist/build/NOM/State/Sorting.o, dist/build/NOM/State/Sorting.dyn_o )
[20 of 25] Compiling NOM.Update       ( lib/NOM/Update.hs, dist/build/NOM/Update.o, dist/build/NOM/Update.dyn_o )
lib/NOM/Update.hs:172:18: error: [GHC-30606] [-Wredundant-constraints, Werror=redundant-constraints]
    Redundant constraint: UpdateMonad m
    In the type signature for:
         processResult :: NixOldStyleMessage -> ProcessingT m Bool
    |
172 | processResult :: (UpdateMonad m) => NixOldStyleMessage -> ProcessingT m Bool
    |                  ^^^^^^^^^^^^^^^