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At the same time, remove the linking exception for the Generator.
Also, mention that the files in test/ are not covered by any license.

which I think was useless.

(This should have done when [production_where] was moved.)

We now treat them normally and generate code for them in the semantic action table.
This is important because they could be reduced via the inspection API;
see the function [force_reduction] in [IncrementalEngine].

replacing it with a simple iteration on the production's right-hand side.

the checkpoints [input_needed env1] and [input_needed env2] are equivalent.