Fix linter warnings with new buildifier version. (#349)

rules/analysis_test.bzl

@@ -16,7 +16,7 @@
 
 def _analysis_test_impl(ctx):
     """Implementation function for analysis_test. """
-    _ignore = [ctx]
+    _ignore = [ctx]  # @unused
     return [AnalysisTestResultInfo(
         success = True,
         message = "All targets succeeded analysis",

tests/selects_tests.bzl

@@ -156,9 +156,6 @@ def _expect_doesnt_match(ctx):
     asserts.equals(env, False, attrval)
     return analysistest.end(env)
 
-def _config_setting_group_test(name, config_settings):
-    return analysistest.make()
-
 ###################################################
 # and_config_setting_group_matches_test
 ###################################################

tests/unittest_tests.bzl

@@ -122,7 +122,7 @@ def _failure_testing_test(ctx):
     return analysistest.end(env)
 
 def _failure_testing_fake_rule(ctx):
-    _ignore = [ctx]
+    _ignore = [ctx]  # @unused
     fail("This rule should never work")
 
 failure_testing_fake_rule = rule(
@@ -146,7 +146,7 @@ def _fail_unexpected_passing_test(ctx):
     return analysistest.end(env)
 
 def _fail_unexpected_passing_fake_rule(ctx):
-    _ignore = [ctx]
+    _ignore = [ctx]  # @unused
     return []
 
 fail_unexpected_passing_fake_rule = rule(
@@ -227,6 +227,7 @@ _AddedByAspectInfo = provider(
 )
 
 def _example_aspect_impl(target, ctx):
+    _ignore = [target, ctx]  # @unused
     return [
         _AddedByAspectInfo(value = "attached by aspect"),
     ]