Merge pull request #213 from jeremyevans/errorsymbolvalue #320

Job	Run time
ruby-versions / Generate Ruby versions	1s
test (2.5, ubuntu-latest)	36s
test (2.5, macos-latest)	4m 49s
test (2.5, windows-latest)	4m 2s
test (2.6, ubuntu-latest)	55s
test (2.6, macos-latest)	1m 39s
test (2.6, windows-latest)	3m 42s
test (2.7, ubuntu-latest)	40s
test (2.7, macos-latest)	1m 18s
test (2.7, windows-latest)	3m 0s
test (3.0, ubuntu-latest)	25s
test (3.0, macos-latest)	51s
test (3.0, windows-latest)	3m 13s
test (3.1, ubuntu-latest)	36s
test (3.1, macos-latest)	1m 9s
test (3.1, windows-latest)	2m 5s
test (3.2, ubuntu-latest)	28s
test (3.2, macos-latest)	1m 3s
test (3.2, windows-latest)	3m 38s
test (head, ubuntu-latest)	25s
test (head, macos-latest)	56s
test (head, windows-latest)	2m 23s
test (jruby, ubuntu-latest)	6m 37s
test (jruby-head, ubuntu-latest)	7m 8s
test (truffleruby, ubuntu-latest)	3m 32s
test (truffleruby-head, ubuntu-latest)	3m 19s
	58m 30s

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