Proposal for a new (ice-9 history)

[Mikael Djurfeldt <mikael@djurfeldt.com>]

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I'd like to rewrite (ice-9 history) to conform to the full GDB value
history syntax. This is because I find that I miss being able to refer to
"the last value" etc.

Currently we have:

$<N> the N:th value from the start

The extension would add bindings for:

$$<N> the N:th value from the end

$ the last value (= $$0)

$$ the value just prior to the last value (= $$1)

Implementation:

Currently, every step in the REPL defines a $<N> in the module
(value-history) the interface of which is appended to the list of used
interfaces for the (current-module).

The new implementation would just add a new result value to a list, not
doing any definition.

The interface of (value-history) would instead have a lazy-binder which
provides a syntax transformer for every $... actually being used. The $...
identifier would expand into a list-ref into the value history.

Please evaluate this suggestion and give comments or an OK.

Best regards,
Mikael Djurfeldt

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