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-rw-r--r--tvix/eval/src/builtins/mod.rs10
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix8
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix8
-rw-r--r--tvix/verify-lang-tests/default.nix5
8 files changed, 38 insertions, 4 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index a2136ee6ad05..b19ba7009f2f 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -523,7 +523,7 @@ mod pure_builtins {
     async fn builtin_gen_list(
         co: GenCo,
         // Nix 2.3 doesn't propagate failures here
-        #[catch] generator: Value,
+        #[lazy] generator: Value,
         length: Value,
     ) -> Result<Value, ErrorKind> {
         let mut out = imbl::Vector::<Value>::new();
@@ -905,7 +905,7 @@ mod pure_builtins {
     }
 
     #[builtin("map")]
-    async fn builtin_map(co: GenCo, #[catch] f: Value, list: Value) -> Result<Value, ErrorKind> {
+    async fn builtin_map(co: GenCo, #[lazy] f: Value, list: Value) -> Result<Value, ErrorKind> {
         let mut out = imbl::Vector::<Value>::new();
 
         // the best span we can get…
@@ -920,7 +920,11 @@ mod pure_builtins {
     }
 
     #[builtin("mapAttrs")]
-    async fn builtin_map_attrs(co: GenCo, f: Value, attrs: Value) -> Result<Value, ErrorKind> {
+    async fn builtin_map_attrs(
+        co: GenCo,
+        #[lazy] f: Value,
+        attrs: Value,
+    ) -> Result<Value, ErrorKind> {
         let attrs = attrs.to_attrs()?;
         let mut out = imbl::OrdMap::new();
 
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp
new file mode 100644
index 000000000000..06712ebc33e4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.exp
@@ -0,0 +1 @@
+[ <LAMBDA> 0 1 2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix
new file mode 100644
index 000000000000..e161e3b4af4f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-genList-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      l = builtins.genList (builtins.head self) 3;
+    in
+    [ (x: x) ] ++ l;
+in
+self
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp
new file mode 100644
index 000000000000..050c2c4de51f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.exp
@@ -0,0 +1 @@
+[ <LAMBDA> 2 "." 18 "https://github.com/NixOS/nix/issues/9779" "-.-" ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix
new file mode 100644
index 000000000000..932d3d0eaebc
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-map-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      l = builtins.map (builtins.head self) [ 2 "." 18 https://github.com/NixOS/nix/issues/9779 "-.-" ];
+    in
+    [ (x: x) ] ++ l;
+in
+self
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp
new file mode 100644
index 000000000000..7e70748ffd6f
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.exp
@@ -0,0 +1 @@
+{ a = 1; b = 2; f = <LAMBDA>; }
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix
new file mode 100644
index 000000000000..2946d6de1760
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-mapAttrs-function-strictness.nix
@@ -0,0 +1,8 @@
+let
+  self =
+    let
+      s = builtins.mapAttrs self.f { a = 1; b = 2; };
+    in
+    { f = _: x: x; } // s;
+in
+self
diff --git a/tvix/verify-lang-tests/default.nix b/tvix/verify-lang-tests/default.nix
index 276a57f12935..772c1c532078 100644
--- a/tvix/verify-lang-tests/default.nix
+++ b/tvix/verify-lang-tests/default.nix
@@ -76,11 +76,14 @@ let
     # b72bc4a972fe568744d98b89d63adcd504cb586c
     "eval-okay-identifier-formatting.nix" = [ nix ];
 
-    # Different catchable behavior between nix 2.3 and 2.18
+    # Differing strictness in the function argument for some builtins in Nix 2.18
+    # https://github.com/NixOS/nix/issues/9779
     "eval-okay-builtins-map-propagate-catchable.nix" = [ nix_latest ];
     "eval-okay-builtins-gen-list-propagate-catchable.nix" = [ nix_latest ];
     "eval-okay-builtins-replace-strings-propagate-catchable.nix" =
       [ nix_latest ];
+    "eval-okay-builtins-map-function-strictness.nix" = [ nix_latest ];
+    "eval-okay-builtins-genList-function-strictness.nix" = [ nix_latest ];
 
     # TODO(sterni): support diffing working directory and home relative paths
     # like C++ Nix test suite (using string replacement).