introspect: include choices for array options

There was even a test covering this, but it did not fail due to a typo.

mesonbuild/mintro.py

@@ -287,6 +287,8 @@ def list_buildoptions(coredata: cdata.CoreData, subprojects: T.Optional[T.List[s
                 typestr = 'integer'
             elif isinstance(opt, cdata.UserArrayOption):
                 typestr = 'array'
+                if opt.choices:
+                    optdict['choices'] = opt.choices
             else:
                 raise RuntimeError("Unknown option type")
             optdict['type'] = typestr

unittests/allplatformstests.py

@@ -1595,6 +1595,7 @@ class AllPlatformTests(BasePlatformTests):
             'section': 'user',
             'type': 'array',
             'value': ['foo', 'bar'],
+            'choices': ['foo', 'bar', 'oink', 'boink'],
             'machine': 'any',
         }
         tdir = os.path.join(self.unit_test_dir, '19 array option')
@@ -1621,6 +1622,7 @@ class AllPlatformTests(BasePlatformTests):
             'section': 'user',
             'type': 'array',
             'value': ['foo', 'bar'],
+            'choices': ['foo', 'bar', 'oink', 'boink'],
             'machine': 'any',
         }
         tdir = os.path.join(self.unit_test_dir, '19 array option')
@@ -1647,6 +1649,7 @@ class AllPlatformTests(BasePlatformTests):
             'section': 'user',
             'type': 'array',
             'value': [],
+            'choices': ['foo', 'bar', 'oink', 'boink'],
             'machine': 'any',
         }
         tdir = os.path.join(self.unit_test_dir, '19 array option')
@@ -1703,7 +1706,7 @@ class AllPlatformTests(BasePlatformTests):
             if item['name'] == 'combo':
                 self.assertEqual(item['value'], 'b')
                 self.assertEqual(item['choices'], ['b', 'c', 'd'])
-            elif item['name'] == 'arr':
+            elif item['name'] == 'array':
                 self.assertEqual(item['value'], ['b'])
                 self.assertEqual(item['choices'], ['b', 'c', 'd'])
 
@@ -1721,7 +1724,7 @@ class AllPlatformTests(BasePlatformTests):
             if item['name'] == 'combo':
                 self.assertEqual(item['value'], 'c')
                 self.assertEqual(item['choices'], ['b', 'c', 'd'])
-            elif item['name'] == 'arr':
+            elif item['name'] == 'array':
                 self.assertEqual(item['value'], ['b', 'c'])
                 self.assertEqual(item['choices'], ['b', 'c', 'd'])