From 98f7254fb25d402a3cad8e7de81207448fc7b322 Mon Sep 17 00:00:00 2001
From: Timothee Cour <timothee.cour2@gmail.com>
Date: Wed, 25 Aug 2021 22:04:18 -0700
Subject: [PATCH] followup #18711 grammar_nanny now reports unused
 non-terminals (#18746)

* followup #18711 cleanup unused grammar rules

* make tools/grammar_nanny.nim report unused terminals

* revert removal of some grammar comments
---
 tools/grammar_nanny.nim | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/grammar_nanny.nim b/tools/grammar_nanny.nim
index 397041559a..5120ef9761 100644
--- a/tools/grammar_nanny.nim
+++ b/tools/grammar_nanny.nim
@@ -4,7 +4,7 @@
 import std / [strutils, sets]
 
 import ".." / compiler / [
-  llstream, ast, lexer, options, msgs, idents,
+  llstream, lexer, options, msgs, idents,
   lineinfos, pathutils]
 
 proc checkGrammarFileImpl(cache: IdentCache, config: ConfigRef) =
@@ -35,6 +35,10 @@ proc checkGrammarFileImpl(cache: IdentCache, config: ConfigRef) =
           usedSyms.incl word
       else:
         rawGetTok(L, tok)
+    for u in declaredSyms:
+      if u notin usedSyms:
+        echo "Unused non-terminal: ", u
+
     for u in usedSyms:
       if u notin declaredSyms:
         echo "Undeclared non-terminal: ", u