Ruby

Merge pull request #2241 from ksss/variable-duplication-error #6127

Job	Run time
test (3.1, test)	2m 18s
test (3.2, test)	2m 4s
test (3.3, test)	2m 31s
test (3.4, test)	2m 15s
test (head, test)	2m 8s
test (head, stdlib_test rubocop)	1m 46s
test (3.4, stdlib_test)	1m 39s
test (3.4, test, --enable-frozen-string-literal)	2m 22s
test (3.4, stdlib_test, --enable-frozen-string-literal)	1m 41s
test (3.4, lexer templates compile confirm_lexer confirm_templates)	2m 58s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 6s
test (3.4, typecheck_test)	54s
	24m 42s

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