Dotty

Detab comment in Synthesizer.scala #36777

Job	Run time
test_non_bootstrapped	29m 13s
MiMa	7m 32s
test	1h 5m 34s
community_build_c	57m 56s
community_build_a	56m 13s
test_windows_full	40m 46s
test_sbt	17m 5s
community_build_b	1h 20m 44s
test_scala2_library_tasty	0s
test_windows_fast	0s
test_java8	-1s
build-sdk-package / build	9m 52s
build-msi-package	-1s
test-msi-package	-1s
build-chocolatey-package / build	25s
test-chocolatey-package	0s
publish_release	0s
publish_nightly	0s
nightly_documentation	0s
open_issue_on_failure	0s
	6h 5m 17s

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