*** Features to be improved or missing
-**** Diagnostic
-
-***** Filtering async warnings
-
-Add a new 'native-comp-async-report-warnings-errors' value such that
-we filter out all the uninteresting warnings (that the programmer
-already got during byte compilation) but we still report the important
-ones ('the function ‘xxx’ is not known to be defined.').
-
-This way even if the package developer doesn't use native compilation
-it can get the bug report for the issue and
-'*Async-native-compile-log*' is not too crowded.
-
-This new value for 'native-comp-async-report-warnings-errors' should
-be default.
-
**** Fix portable dumping so that you can redump without using -batch
***** Redumps and native compiler "preloaded" sub-folder.