lib/types: Make types.anything merge functions

Previously it would give an error if there were multiple function
definitions.

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/types.nix b/lib/types.nix
index a0be2ff3a45..c2532065d7e 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -192,6 +192,12 @@ rec {
               else (listOf anything).merge;
             # This is the type of packages, only accept a single definition
             stringCoercibleSet = mergeOneOption;
+            lambda = loc: defs: arg: anything.merge
+              (loc ++ [ "<function body>" ])
+              (map (def: {
+                file = def.file;
+                value = def.value arg;
+              }) defs);
             # Otherwise fall back to only allowing all equal definitions
           }.${commonType} or mergeEqualOption;
         in mergeFunction loc defs;