rename a badly named KwargInfo

CT_OUTPUT_KW is the same OUTPUT_KW we use in lots of places. The most
distinctive thing about it is not that it's part of custom_target
(basically any other function that uses such a kwarg follows the same
rules due to using CustomTarget under the hood), but the fact that it
takes multiple outputs.

mesonbuild/interpreter/interpreter.py

@@ -57,7 +57,7 @@ from .type_checking import (
     CT_BUILD_BY_DEFAULT,
     CT_INPUT_KW,
     CT_INSTALL_DIR_KW,
-    CT_OUTPUT_KW,
+    MULTI_OUTPUT_KW,
     OUTPUT_KW,
     DEFAULT_OPTIONS,
     DEPENDS_KW,
@@ -1761,7 +1761,7 @@ class Interpreter(InterpreterBase, HoldableObject):
     @typed_kwargs(
         'vcs_tag',
         CT_INPUT_KW.evolve(required=True),
-        CT_OUTPUT_KW,
+        MULTI_OUTPUT_KW,
         # Cannot use the COMMAND_KW because command is allowed to be empty
         KwargInfo(
             'command',
@@ -1851,7 +1851,7 @@ class Interpreter(InterpreterBase, HoldableObject):
         CT_INPUT_KW,
         CT_INSTALL_DIR_KW,
         CT_INSTALL_TAG_KW,
-        CT_OUTPUT_KW,
+        MULTI_OUTPUT_KW,
         DEPENDS_KW,
         DEPEND_FILES_KW,
         DEPFILE_KW,

mesonbuild/interpreter/type_checking.py

@@ -268,7 +268,7 @@ def _output_validator(outputs: T.List[str]) -> T.Optional[str]:
 
     return None
 
-CT_OUTPUT_KW: KwargInfo[T.List[str]] = KwargInfo(
+MULTI_OUTPUT_KW: KwargInfo[T.List[str]] = KwargInfo(
     'output',
     ContainerTypeInfo(list, str, allow_empty=False),
     listify=True,

mesonbuild/modules/i18n.py

@@ -20,7 +20,7 @@ from . import ExtensionModule, ModuleReturnValue
 from .. import build
 from .. import mesonlib
 from .. import mlog
-from ..interpreter.type_checking import CT_BUILD_BY_DEFAULT, CT_INPUT_KW, CT_INSTALL_DIR_KW, CT_INSTALL_TAG_KW, CT_OUTPUT_KW, INSTALL_KW, NoneType, in_set_validator
+from ..interpreter.type_checking import CT_BUILD_BY_DEFAULT, CT_INPUT_KW, CT_INSTALL_DIR_KW, CT_INSTALL_TAG_KW, MULTI_OUTPUT_KW, INSTALL_KW, NoneType, in_set_validator
 from ..interpreterbase import FeatureNew
 from ..interpreterbase.decorators import ContainerTypeInfo, KwargInfo, noPosargs, typed_kwargs, typed_pos_args
 from ..scripts.gettext import read_linguas
@@ -154,7 +154,7 @@ class I18nModule(ExtensionModule):
         CT_INPUT_KW,
         CT_INSTALL_DIR_KW,
         CT_INSTALL_TAG_KW,
-        CT_OUTPUT_KW,
+        MULTI_OUTPUT_KW,
         INSTALL_KW,
         _ARGS.evolve(since='0.51.0'),
         _DATA_DIRS.evolve(since='0.41.0'),
@@ -323,7 +323,7 @@ class I18nModule(ExtensionModule):
         CT_INPUT_KW,
         CT_INSTALL_DIR_KW,
         CT_INSTALL_TAG_KW,
-        CT_OUTPUT_KW,
+        MULTI_OUTPUT_KW,
         INSTALL_KW,
         _ARGS.evolve(),
         KwargInfo('its_files', ContainerTypeInfo(list, str)),