Dotty

Add test for StackOverflow question 68877939 (#21775) #32827

Job	Run time
test_non_bootstrapped	30m 15s
test	58m 51s
test_scala2_library_tasty	0s
test_windows_fast	0s
test_windows_full	59m 18s
community_build_a	1h 0m 43s
MiMa	11m 37s
community_build_b	1h 24m 40s
community_build_c	1h 7m 0s
test_sbt	18m 27s
test_java8	0s
build-msi-package	0s
build-sdk-package / build	7m 58s
build-chocolatey-package / build	23s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 39m 12s

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