lib.customisation: uncurry makeScopeWithSplicing

Deeply-curried functions are pretty error-prone in untyped languages
like Nix.  This is a particularly bad case because
`top-level/splice.nix` *also* declares a makeScopeWithSplicing, but
it takes *two fewer arguments*.

Let's switch to attrset-passing form, to provide some minimal level
of sanity-checking.

1 files changed, 5 insertions, 1 deletions

diff --git a/pkgs/games/steam/default.nix b/pkgs/games/steam/default.nix
index 370f22268a9ab..ebd0570d351a0 100644
--- a/pkgs/games/steam/default.nix
+++ b/pkgs/games/steam/default.nix
@@ -34,4 +34,8 @@ let
   };
   keep = self: { };
   extra = spliced0: { };
-in makeScopeWithSplicing (generateSplicesForMkScope "steamPackages") keep extra steamPackagesFun
+in makeScopeWithSplicing {
+  otherSplices = generateSplicesForMkScope "steamPackages";
+  inherit keep extra;
+  f = steamPackagesFun;
+}