diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 72ed364..4e26138 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -4,5 +4,7 @@ FROM mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04
 # RUN su vscode -c "${VCPKG_ROOT}/vcpkg install <your-port-name-here>"
 
 # [Optional] Uncomment this section to install additional packages.
-# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-#     && apt-get -y install --no-install-recommends <your-package-list-here>
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends \
+    clang-format \
+    && rm -rf /var/lib/apt/lists/*
diff --git a/examples/readme.cpp b/examples/readme.cpp
index 2b2462c..a5c2ebb 100644
--- a/examples/readme.cpp
+++ b/examples/readme.cpp
@@ -145,7 +145,7 @@ constexpr auto WithSummary = trait{
 
 // ... you can use a trait
 
-decltype(auto) operator<<(std::ostream & stream, is<Drawable> auto const& drawable) {
+decltype(auto) operator<<(std::ostream& stream, is<Drawable> auto const& drawable) {
     drawable.draw(stream);
     return stream;
 }
diff --git a/include/traits.h b/include/traits.h
index 1e6e702..fb60387 100644
--- a/include/traits.h
+++ b/include/traits.h
@@ -1159,8 +1159,8 @@ struct variant_constraint {
 
     template <typename T>
     constexpr auto operator()() const noexcept {
-        return (... or std::same_as<T, Alternatives>)and OtherConstraints{}
-            .template operator()<T>();
+        return (... or std::same_as<T, Alternatives>) and
+               OtherConstraints{}.template operator()<T>();
     }
 };