Dotty

Fix false exhaustivity warning for pattern returning NamedTuple #35960

Job	Run time
test_windows_fast	37m 11s
test	1h 9m 47s
community_build_b	1h 26m 5s
MiMa	10m 32s
test_sbt	16m 32s
community_build_c	1h 5m 27s
community_build_a	51m 25s
build-sdk-package / build	9m 28s
test_scala2_library_tasty	0s
test_windows_full	0s
test_java8	0s
build-msi-package	0s
test-msi-package	0s
test_non_bootstrapped	0s
build-chocolatey-package / build	21s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	-1s
open_issue_on_failure	0s
	5h 46m 47s

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