Dotty

Some usability improvements relating to errors #35969

Job	Run time
test	1h 9m 58s
test_windows_fast	35m 26s
community_build_a	50m 16s
MiMa	11m 29s
community_build_b	1h 20m 41s
community_build_c	1h 3m 57s
test_sbt	18m 27s
build-sdk-package / build	8m 57s
build-msi-package	0s
test_non_bootstrapped	0s
test_java8	0s
test_scala2_library_tasty	-1s
test_windows_full	-1s
test-msi-package	-1s
build-chocolatey-package / build	20s
test-chocolatey-package	-1s
publish_nightly	0s
nightly_documentation	0s
publish_release	0s
open_issue_on_failure	0s
	5h 39m 27s

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