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Defined the type [stack] as an abbreviation for [element stream].

Used it to clean up Printers and Calc.

  (Not great, but they don't deserve a separate module yet.)
Updated Printers and Calc.

and the functor [Symbols] (in [InspectionTableInterpreter]).
This removes the need for generating the types [symbol] and [xsymbol].
The module [SymbolType] in the table back-end disappears.

not work.
Exposed the definition of [symbol] in terms of [terminal] and [nonterminal].
This allows removing this definition from the generated [.mli] file.

Also included the concrete definition of [xsymbol] in this signature.

Things are reasonably clean now.

  to support --inspection.
The signature IncrementalEngine.INSPECTION documents what the user sees.
The signature TableFormat.INSPECTION_TABLES documents what we generate.
The functor TableInterpreter.MakeInspection bridges the gap.

The type env no longer needs to be parameterized.
This makes the API safe (and simpler).
There a slight runtime cost (e.g., from 4.6s to 4.7 seconds).

This seems to cause roughly a 10% speed loss (e.g. from 4.3 to 4.6 seconds).
The current interface is not satisfactory, as it allows the user to
manufacture a continuation that will break our invariants and lead
to a crash.

[lr1state], [element], [stream] and of the function [view].

IncrementalEngine, so as to reduce confusion and allow
including this file in the documentation.