Dotty

Allow named tuple syntax for case class constructors. #33995

Job	Run time
test_non_bootstrapped	0s
test	57m 28s
test_scala2_library_tasty	0s
test_windows_fast	50m 14s
MiMa	10m 41s
test_windows_full	0s
community_build_a	1h 6m 18s
community_build_c	1h 0m 28s
build-msi-package	0s
community_build_b	1h 30m 41s
test_java8	0s
test_sbt	20m 35s
build-sdk-package / build	7m 59s
test-msi-package	0s
build-chocolatey-package / build	20s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 4m 44s

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