libexpr: Soft-deprecate __overrides

Change-Id: I787e69e1dad6edc5ccdb747b74a9ccd6e8e13bb3

2 files changed, 10 insertions, 0 deletions

diff --git a/src/libutil/deprecated-features.cc b/src/libutil/deprecated-features.cc
index 877d69da0..de4efd93b 100644
--- a/src/libutil/deprecated-features.cc
+++ b/src/libutil/deprecated-features.cc
@@ -28,6 +28,15 @@ constexpr size_t numDepFeatures = 1 + static_cast<size_t>(Dep::UrlLiterals);
 
 constexpr std::array<DeprecatedFeatureDetails, numDepFeatures> depFeatureDetails = {{
     {
+        .tag = Dep::RecSetOverrides,
+        .name = "rec-set-overrides",
+        .description = R"(
+            Allow `__overrides` in recursive attribute sets.
+
+            Use fix point functions (e.g. `lib.fix` in Nixpkgs) instead.
+        )",
+    },
+    {
         .tag = Dep::UrlLiterals,
         .name = "url-literals",
         .description = R"(
diff --git a/src/libutil/deprecated-features.hh b/src/libutil/deprecated-features.hh
index 3776e6c29..d4d8a57a9 100644
--- a/src/libutil/deprecated-features.hh
+++ b/src/libutil/deprecated-features.hh
@@ -18,6 +18,7 @@ namespace nix {
  */
 enum struct DeprecatedFeature
 {
+    RecSetOverrides,
     UrlLiterals,
 };