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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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I've faced two gotchas.
First of all posterasure, which is supposed to erase ErasedValueType types,
didn't look into ConstantType.value that is known to be smuggling types
(hi Paul that's a plus one).
Secondly ClassManifest.classType[T] assumed that its T is bound by AnyRef,
which is not the case for value types. Here I had two choices:
a) introduce a special method for manifests of value types,
b) remove the upper bound of the type parameter and call it a day.
Since manifests are already deprecated and there's no difference which
method was used to create which manifest, I went for option b).
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