Dotty

Discourage default arg for extension receiver #34474

Job	Run time
test	56m 15s
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
MiMa	11m 13s
test_windows_fast	40m 58s
community_build_a	54m 2s
community_build_b	1h 21m 35s
test_windows_full	0s
community_build_c	1h 6m 23s
test_sbt	18m 57s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 56s
test-msi-package	0s
build-chocolatey-package / build	21s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 37m 40s

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