`require` on Ractors #54

Job	Run time
make (test, --parser=prism, -v --tty=no, 30)	4m 23s
make (test-all, --parser=prism, -q --tty=no --excludes-dir="../src/test/.excludes-prism" --exclud...	7m 56s
make (test-spec, --parser=prism, -T --parser=prism, 10)	4m 23s
make (test-tool, --parser=prism, -v --tty=no, 30)	3m 51s
make (test-bundler-parallel, --parser=prism, -v --tty=no, 30)	31m 21s
make (test-bundled-gems, --parser=prism, -v --tty=no, 30)	17m 38s
make (test-syntax-suggest, --parser=prism, -v --tty=no, 30)	3m 53s
	1h 13m 25s

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