Deprecate infix named args #32918

Job	Run time
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test_windows_fast	31m 29s
community_build_a	50m 29s
MiMa	12m 3s
test	53m 40s
community_build_b	1h 30m 41s
community_build_c	1h 8m 17s
test_sbt	18m 37s
test_windows_full	0s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 54s
build-chocolatey-package / build	19s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 33m 29s

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