Debug bundled-gems allow_failures

it seems not working in
https://dev.azure.com/rubylang/ruby/_build/results?buildId=392

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67555 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Makefile.in

@@ -533,6 +533,7 @@ cont.$(OBJEXT): $(COROUTINE_H)
 TEST_BUNDLED_GEMS_ALLOW_FAILURES =
 
 test-bundled-gems-run:
+	$(ECHO) allow_failures: $(TEST_BUNDLED_GEMS_ALLOW_FAILURES)
 	$(Q) set -e; while read gem _; do \
 	  echo testing $$gem gem; \
 	  if echo $(TEST_BUNDLED_GEMS_ALLOW_FAILURES) | grep -q $$gem; then \

azure-pipelines.yml

@@ -7,8 +7,7 @@ jobs:
     matrix:
       bundled_gems:
         task: test-bundled-gems
-        TEST_BUNDLED_GEMS_ALLOW_FAILURES: |
-          minitest
+        TEST_BUNDLED_GEMS_ALLOW_FAILURES: minitest
       bundler:
         task: test-bundler
   steps:
@@ -44,8 +43,7 @@ jobs:
 #        task: test-spec
       bundled_gems:
         task: test-bundled-gems
-        TEST_BUNDLED_GEMS_ALLOW_FAILURES: |
-          minitest
+        TEST_BUNDLED_GEMS_ALLOW_FAILURES: minitest
       bundler:
         task: test-bundler
   steps: