tests: add error tests for builtins.genericClosure

Covers error conditions for:
- Invalid argument types (not an attrset)
- Missing required attributes (startSet, operator)
- Type mismatches (startSet/operator not correct type)
- Element validation (elements not attrsets, missing key attribute)
- Key comparison errors (incompatible types, uncomparable types)
- Operator return value validation (not a list)

tests/functional/lang/eval-fail-genericClosure-element-missing-key.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-element-missing-key.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [ { nokey = 1; } ];
+
+       … in one of the attrsets generated by (or initially passed to) builtins.genericClosure
+
+       error: attribute 'key' missing

tests/functional/lang/eval-fail-genericClosure-element-missing-key.nix

@@ -0,0 +1,4 @@
+builtins.genericClosure {
+  startSet = [ { nokey = 1; } ];
+  operator = x: [ ];
+}

tests/functional/lang/eval-fail-genericClosure-element-not-attrset.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-element-not-attrset.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [ "not an attrset" ];
+
+       … while evaluating one of the elements generated by (or initially passed to) builtins.genericClosure
+
+       error: expected a set but found a string: "not an attrset"

tests/functional/lang/eval-fail-genericClosure-element-not-attrset.nix

@@ -0,0 +1,4 @@
+builtins.genericClosure {
+  startSet = [ "not an attrset" ];
+  operator = x: [ ];
+}

tests/functional/lang/eval-fail-genericClosure-keys-incompatible-types.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-keys-incompatible-types.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [
+
+       … while comparing the `key` attributes of two genericClosure elements
+
+       error: cannot compare a string with an integer

tests/functional/lang/eval-fail-genericClosure-keys-incompatible-types.nix

@@ -0,0 +1,7 @@
+builtins.genericClosure {
+  startSet = [
+    { key = 1; }
+    { key = "string"; }
+  ];
+  operator = x: [ ];
+}

tests/functional/lang/eval-fail-genericClosure-keys-uncomparable.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-keys-uncomparable.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [
+
+       … while comparing the `key` attributes of two genericClosure elements
+
+       error: cannot compare a set with a set; values of that type are incomparable

tests/functional/lang/eval-fail-genericClosure-keys-uncomparable.nix

@@ -0,0 +1,7 @@
+builtins.genericClosure {
+  startSet = [
+    { key = { }; }
+    { key = { }; }
+  ];
+  operator = x: [ ];
+}

tests/functional/lang/eval-fail-genericClosure-missing-operator.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-missing-operator.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [ { key = 1; } ];
+
+       … in the attrset passed as argument to builtins.genericClosure
+
+       error: attribute 'operator' missing

tests/functional/lang/eval-fail-genericClosure-missing-operator.nix

@@ -0,0 +1,3 @@
+builtins.genericClosure {
+  startSet = [ { key = 1; } ];
+}

tests/functional/lang/eval-fail-genericClosure-missing-startSet.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-missing-startSet.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   operator = x: [ ];
+
+       … in the attrset passed as argument to builtins.genericClosure
+
+       error: attribute 'startSet' missing

tests/functional/lang/eval-fail-genericClosure-missing-startSet.nix

@@ -0,0 +1,3 @@
+builtins.genericClosure {
+  operator = x: [ ];
+}

tests/functional/lang/eval-fail-genericClosure-not-attrset.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-not-attrset.nix:1:1:
+            1| builtins.genericClosure "not an attrset"
+             | ^
+            2|
+
+       … while evaluating the first argument passed to builtins.genericClosure
+
+       error: expected a set but found a string: "not an attrset"

tests/functional/lang/eval-fail-genericClosure-not-attrset.nix

@@ -0,0 +1 @@
+builtins.genericClosure "not an attrset"

tests/functional/lang/eval-fail-genericClosure-operator-not-function.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-operator-not-function.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [ { key = 1; } ];
+
+       … while evaluating the 'operator' attribute passed as argument to builtins.genericClosure
+
+       error: expected a function but found a string: "not a function"

tests/functional/lang/eval-fail-genericClosure-operator-not-function.nix

@@ -0,0 +1,4 @@
+builtins.genericClosure {
+  startSet = [ { key = 1; } ];
+  operator = "not a function";
+}

tests/functional/lang/eval-fail-genericClosure-operator-not-list.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-operator-not-list.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = [ { key = 1; } ];
+
+       … while evaluating the return value of the `operator` passed to builtins.genericClosure
+
+       error: expected a list but found a string: "not a list"

tests/functional/lang/eval-fail-genericClosure-operator-not-list.nix

@@ -0,0 +1,4 @@
+builtins.genericClosure {
+  startSet = [ { key = 1; } ];
+  operator = x: "not a list";
+}

tests/functional/lang/eval-fail-genericClosure-startSet-not-list.err.exp

@@ -0,0 +1,10 @@
+error:
+       … while calling the 'genericClosure' builtin
+         at /pwd/lang/eval-fail-genericClosure-startSet-not-list.nix:1:1:
+            1| builtins.genericClosure {
+             | ^
+            2|   startSet = "not a list";
+
+       … while evaluating the 'startSet' attribute passed as argument to builtins.genericClosure
+
+       error: expected a list but found a string: "not a list"

tests/functional/lang/eval-fail-genericClosure-startSet-not-list.nix

@@ -0,0 +1,4 @@
+builtins.genericClosure {
+  startSet = "not a list";
+  operator = x: [ ];
+}