is_disabler: do not flatten positional args

Author: xclaesse

docs/yaml/functions/is_disabler.yaml

@@ -1,7 +1,11 @@
 name: is_disabler
 returns: bool
 since: 0.52.0
-description: Returns true if a variable is a disabler and false otherwise.
+description: |
+  Returns true if a variable is a disabler and false otherwise.
+
+  Since 1.10.0, if the argument is a list, it returns false even if an element of
+  the list is a disabler.
 
 posargs:
   var:

mesonbuild/interpreter/interpreter.py

@@ -3589,7 +3589,10 @@ def machine_from_native_kwarg(kwargs: T.Dict[str, T.Any]) -> MachineChoice:
     @FeatureNew('is_disabler', '0.52.0')
     @typed_pos_args('is_disabler', object)
     @noKwargs
+    @noArgsFlattening
     def func_is_disabler(self, node: mparser.BaseNode, args: T.Tuple[object], kwargs: 'TYPE_kwargs') -> bool:
+        if isinstance(args[0], list):
+            FeatureNew.single_use('is_disabler with list argument', '1.10.0', self.subproject, location=node)
         return isinstance(args[0], Disabler)
 
     @noKwargs

test cases/common/158 disabler/meson.build

@@ -151,3 +151,6 @@ foreach k, i : {'a': true, 'b': disabler(), 'c': true}
 endforeach
 assert(loops == 3, 'Disabler in foreach dict')
 assert(disablers == 1, 'Disabler in foreach dict')
+
+array = [1, disabler(), 3]
+assert(not is_disabler(array))