Ruby

Merge pull request #2559 from ksss/rbs-lint-duplicate_overload-argument #7060

Job	Run time
C99_compile (head)	1m 14s
C99_compile (3.4)	45s
test (3.4, test)	3m 12s
test (3.2, test)	2m 51s
test (3.4, stdlib_test)	2m 29s
test (head, stdlib_test rubocop)	3m 20s
test (3.1, test)	2m 55s
test (3.3, test)	3m 19s
test (head, test)	3m 48s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 17s
test (3.4, test, --enable-frozen-string-literal)	3m 7s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 44s
test (3.4, typecheck_test)	1m 21s
	33m 22s

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