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Some scalac output is on stderr, and it's useful to see that
in the log file, especially for debugging.
Adds a line filter for logs, specified as "filter: pattern"
in the test source.
Backslashes are made forward only when detected as paths.
Test alignments:
Deprecations which do not pertain to the system under test
are corrected in the obvious way.
When testing deprecated API, suppress warnings by deprecating
the Test object.
Check files are updated with useful true warnings, instead of
running under -nowarn.
Language feature imports as required, instead of running under -language.
Language feature not required, such as casual use of postfix.
Heed useful warning.
Ignore broken warnings. (Rarely, -nowarn.)
Inliner warnings pop up under -optimise only, so for now, just
filter them out where they occur.
Debug output from the test required an update.
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The symbol of This, if it points to a package class, isn't touched, just
as usual, so that our Select(Select(Select(...))) => This(...) optimization
works fine with attr reset.
However the tpe is now erased, so that subsequent reflective compilation
doesn't spuriously fail when seeing that some subtrees of a tree being
compiled are typed.
Erasing the tpe doesn't pose even a tiniest problem, because, as it can
be seen in typedThis, type is trivially reconstructed from the symbol.
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