pylint: check for duplicate imports

I ran into one of these from LGTM, and it would be nice if pylint could
warn me as part of my local development process instead of waiting for
the CI to tell me.

.pylintrc

@@ -22,6 +22,7 @@ enable=
     mixed-indentation,
     no-value-for-parameter,
     redundant-keyword-arg,
+    reimported,
     singleton-comparison,
     superfluous-parens,
     too-many-function-args,

mesonbuild/build.py

@@ -33,7 +33,7 @@ from .mesonlib import (
     extract_as_list, typeslistify, stringlistify, classify_unity_sources,
     get_filenames_templates_dict, substitute_values, has_path_sep,
     OptionKey, PerMachineDefaultable,
-    MesonBugException, FileOrString,
+    MesonBugException,
 )
 from .compilers import (
     Compiler, is_object, clink_langs, sort_clink, lang_suffixes,
@@ -902,7 +902,7 @@ class BuildTarget(Target):
             if t in self.kwargs:
                 self.kwargs[t] = listify(self.kwargs[t], flatten=True)
 
-    def extract_objects(self, srclist: T.List[FileOrString]) -> ExtractedObjects:
+    def extract_objects(self, srclist: T.List['FileOrString']) -> ExtractedObjects:
         obj_src: T.List['File'] = []
         sources_set = set(self.sources)
         for src in srclist:

mesonbuild/cmake/executor.py

@@ -28,7 +28,6 @@ from ..mesonlib import PerMachine, Popen_safe, version_compare, MachineChoice, i
 from ..programs import find_external_program, NonExistingExternalProgram
 
 if T.TYPE_CHECKING:
-    from ..environment import Environment
     from ..programs import ExternalProgram
 
 TYPE_result    = T.Tuple[int, T.Optional[str], T.Optional[str]]

mesonbuild/compilers/cpp.py

@@ -47,7 +47,7 @@ if T.TYPE_CHECKING:
     from ..environment import Environment
     from ..linkers import DynamicLinker
     from ..programs import ExternalProgram
-    from .mixins.clike import CLikeCompiler as CompilerMixinBase
+    CompilerMixinBase = CLikeCompiler
 else:
     CompilerMixinBase = object
 

mesonbuild/compilers/d.py

@@ -33,11 +33,12 @@ from .compilers import (
 from .mixins.gnu import GnuCompiler
 
 if T.TYPE_CHECKING:
-    from .compilers import Compiler as CompilerMixinBase
     from ..programs import ExternalProgram
     from ..envconfig import MachineInfo
     from ..environment import Environment
     from ..linkers import DynamicLinker
+
+    CompilerMixinBase = Compiler
 else:
     CompilerMixinBase = object
 

mesonbuild/environment.py

@@ -49,7 +49,6 @@ from mesonbuild import envconfig
 if T.TYPE_CHECKING:
     from configparser import ConfigParser
 
-    from .dependencies import ExternalProgram
     from .wrap.wrap import Resolver
 
 build_filename = 'meson.build'

mesonbuild/modules/qt.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from mesonbuild import coredata
 import os
 import shutil
 import typing as T
@@ -21,10 +20,10 @@ import xml.etree.ElementTree as ET
 
 from . import ModuleReturnValue, ExtensionModule
 from .. import build
+from .. import coredata
 from .. import mlog
 from ..dependencies import find_external_dependency, Dependency, ExternalLibrary
 from ..mesonlib import MesonException, File, FileOrString, version_compare, Popen_safe
-from . import ModuleReturnValue, ExtensionModule
 from ..interpreter import extract_required_kwarg
 from ..interpreter.type_checking import NoneType
 from ..interpreterbase import ContainerTypeInfo, FeatureDeprecated, KwargInfo, noPosargs, FeatureNew, typed_kwargs