Fix mypy errors

mesonbuild/build.py

@@ -2325,7 +2325,7 @@ class CustomTarget(Target, CommandBase):
 
     install_dir: T.List[T.Union[str, bool]]
 
-    def __init__(self, name: str, subdir: str, subproject: str, kwargs: T.Dict[str, T.Any],
+    def __init__(self, name: str, subdir: str, subproject: str, kwargs: T.Mapping[str, T.Any],
                  absolute_paths: bool = False, backend: T.Optional['Backend'] = None):
         self.typename = 'custom'
         # TODO expose keyword arg to make MachineChoice.HOST configurable

mesonbuild/dependencies/detect.py

@@ -59,12 +59,12 @@ def get_dep_identifier(name: str, kwargs: T.Dict[str, T.Any]) -> 'TV_DepID':
             continue
         # All keyword arguments are strings, ints, or lists (or lists of lists)
         if isinstance(value, list):
-            value = frozenset(listify(value))
             for i in value:
                 assert isinstance(i, str)
+            value = tuple(frozenset(listify(value)))
         else:
             assert isinstance(value, (str, bool, int))
-        identifier += (key, value)
+        identifier = (*identifier, (key, value),)
     return identifier
 
 display_name_map = {

mesonbuild/interpreter/interpreterobjects.py

@@ -783,6 +783,7 @@ class BuildTargetHolder(ObjectHolder[_BuildTarget]):
     def __repr__(self) -> str:
         r = '<{} {}: {}>'
         h = self.held_object
+        assert isinstance(h, build.BuildTarget)
         return r.format(self.__class__.__name__, h.get_id(), h.filename)
 
     @property

mesonbuild/mesonlib/universal.py

@@ -1731,9 +1731,7 @@ class OrderedSet(T.MutableSet[_T]):
         return 'OrderedSet()'
 
     def __reversed__(self) -> T.Iterator[_T]:
-        # Mypy is complaining that sets can't be reversed, which is true for
-        # unordered sets, but this is an ordered, set so reverse() makes sense.
-        return reversed(self.__container.keys())  # type: ignore
+        return reversed(self.__container.keys())
 
     def add(self, value: _T) -> None:
         self.__container[value] = None

run_project_tests.py

@@ -313,7 +313,7 @@ class StopException(Exception):
     def __init__(self) -> None:
         super().__init__('Stopped by user')
 
-def stop_handler(signal: signal.Signals, frame: T.Optional['FrameType']) -> None:
+def stop_handler(signal: int, frame: T.Optional['FrameType']) -> None:
     global stop
     stop = True
 signal.signal(signal.SIGINT, stop_handler)