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This ensures that the "incremental" file that is created when precompilation fails, will be removed when precompilation succeeds.
Fixes: #4003
Also simplifies the path of the incremental file to be
$output.incremental
. This simplifies the directory handling a bit.Fixes: #3896
Added a test that caching takes effect (such that second compilation is much faster). This test is somewhat fragile - but I'm not sure we have a better way to test this.