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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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If a captured var was inited from a try/catch we did something
reasonable. But if the var was inited from a more complicated expression
(if/else, a block, match/case, etc) that ended with
a try/catch then we didn't and we were generating faulty byte code.
This fix patches LambdaLift to add the missing cases.
For known simple expressions, the translation is just new *Ref(expr).
For try/catch, if/else, match/case, and blocks this recursively
walks down the internal result expressions to translate them. E.g.
if(cond) trueExpr else falseExpr becomes if(cone) translate(trueExpr)
else translate(falseExpr)
For unknown expression types, the translation is {val temp = expr; new
*Ref(expr) }
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