Akim Demaille 781d2b02de gram: detect and report (in debug traces) useless chain rules ...

A rule is a useless chain iff it's a chain (aka unit, or injection)
rule (i.e., the RHS has length 1), and it's useless (it has no used
defined semantic action).

* src/gram.h, src/gram.c (rule_useless_chain_p): New.
(grammar_dump): Report useless chain rules.
* tests/sets.at: Check the traces.

2019-01-30 07:08:09 +01:00

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