Dotty

More improvements to error messages #36803

Job	Run time
test_windows_fast	33m 33s
test	1h 7m 26s
test_scala2_library_tasty	0s
MiMa	8m 52s
test_sbt	19m 34s
community_build_c	59m 19s
community_build_a	52m 17s
test_windows_full	0s
community_build_b	1h 31m 25s
test_java8	0s
test_non_bootstrapped	0s
build-sdk-package / build	10m 5s
build-msi-package	0s
test-msi-package	0s
build-chocolatey-package / build	27s
test-chocolatey-package	0s
publish_release	-1s
publish_nightly	-1s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 42m 56s

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