Add kwarg checker in module code.

mesonbuild/modules/__init__.py

@@ -3,9 +3,11 @@ import os
 from .. import build
 from .. import dependencies
 from ..mesonlib import MesonException
+from ..interpreterbase import permittedKwargs, noKwargs
 
 _found_programs = {}
 
+
 class ExtensionModule:
     def __init__(self):
         self.snippets = set() # List of methods that operate only on the interpreter.

mesonbuild/modules/modtest.py

@@ -14,9 +14,11 @@
 
 from . import ModuleReturnValue
 from . import ExtensionModule
+from . import noKwargs
 
 class TestModule(ExtensionModule):
 
+    @noKwargs
     def print_hello(self, state, args, kwargs):
         print('Hello from a Meson module')
         rv = ModuleReturnValue(None, [])

test cases/failing/57 kwarg in module/meson.build

@@ -0,0 +1,5 @@
+project('module test', 'c')
+
+modtest = import('modtest', i_cause: 'a_build_failure')
+modtest.print_hello()
+