nixExperimental: init

pkgs/tools/package-management/nix/default.nix

@@ -227,6 +227,10 @@ in rec {
     inherit storeDir stateDir confDir boehmgc;
   });
 
+  nixExperimental = nixUnstable.overrideAttrs (prev: {
+    patches = (prev.patches or []) ++ [ ./enable-all-experimental.patch ];
+  });
+
   nixFlakes = nixUnstable.overrideAttrs (prev: {
     patches = (prev.patches or []) ++ [ ./enable-flakes.patch ];
   });

pkgs/tools/package-management/nix/enable-all-experimental.patch

@@ -0,0 +1,14 @@
+diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
+index d3b27d7be..e7d002e1d 100644
+--- a/src/libstore/globals.cc
++++ b/src/libstore/globals.cc
+@@ -172,8 +172,7 @@ MissingExperimentalFeature::MissingExperimentalFeature(std::string feature)
+ 
+ void Settings::requireExperimentalFeature(const std::string & name)
+ {
+-    if (!isExperimentalFeatureEnabled(name))
+-        throw MissingExperimentalFeature(name);
++    return;
+ }
+ 
+ bool Settings::isWSL1()

pkgs/top-level/all-packages.nix

@@ -30099,7 +30099,8 @@ in
     nix
     nixStable
     nixUnstable
-    nixFlakes;
+    nixFlakes
+    nixExperimental;
 
   nixStatic = pkgsStatic.nix;