PEG rules get "compiled" to functions with name `peg-rule <RULE>`.
`define-peg-ruleset` instead defines it PEG rules with name
`peg-rule <RULESET> <RULE>`, so that they can be made visible
by `with-peg-rules` simply by adding local aliases from
`peg-rule <RULE>` to `peg-rule <RULESET> <RULE>`.
Apparently when I added `define-peg-ruleset` I somehow failed to
install some of the corresponding code in `with-peg-rules`, so
the aliases were not installed, making it "impossible" to use
rulesets.
[ I still have no idea how this happened and/or where
the missing code went, so I "recreated" it. ]
* lisp/progmodes/peg.el (with-peg-rules): Install the aliases
for the rulesets.
(peg--translate-rule-body): Try and preserve
location info when emitting a warning.
* test/lisp/progmodes/peg-tests.el (peg-test-myrules): New ruleset.
(peg-test-ruleset): New test.
* lisp/progmodes/peg.el (peg-parse): Refine heuristic since unknown
terminals are resolved at run-time rather than compile-time now.
(peg--macroexpand) <stack-action>: Avoid generating a `let` with an
empty body.
(peg--translate-rule-body): Adjust to name change of
`macroexp-warn-and-return` and the fact that it's always available.
* test/lisp/progmodes/peg-tests.el (peg-parse-string):
Add `indent` declaration.
(peg-test): Check that the compiler emits the warnings we expect.
* doc/lispref/peg.texi (Parsing Expression Grammars)
(PEX Definitions, Parsing Actions, Writing PEG Rules): Fix markup,
indexing, and wording.
* etc/NEWS: Fix wording of PEG entry.
* test/lisp/progmodes/peg-tests.el: Move from test/lisp/, to match
the directory of peg.el.
