When rust edition
appears in both overrides and compiler-options, prefer the options
#6789
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Fix #5429, #6559
This particular fix was chosen -
(1) To make the behavior match future rust versions (as this suggestion was accepted),
(2) because of the pains reported here and here
Along the way made
fixIncompatibleOptions
andchangeOptionsBasedOnOverrides
operate on arguments by reference, just seem to make more sense.