Dotty

Fix false unreachable case warning #36976

Job	Run time
test	1h 8m 1s
community_build_c	1h 7m 10s
community_build_b	1h 17m 18s
community_build_a	47m 37s
test_windows_fast	33m 9s
MiMa	10m 23s
build-sdk-package / build	9m 56s
test_sbt	17m 46s
test_java8	0s
test_non_bootstrapped	0s
build-msi-package	0s
test_windows_full	0s
test_scala2_library_tasty	0s
test-msi-package	0s
build-chocolatey-package / build	27s
test-chocolatey-package	0s
publish_release	-1s
	5h 31m 46s

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