From fef774f78fcb3516fff470a910f4634f29832450 Mon Sep 17 00:00:00 2001
From: Jan Rydzewski <SupraSummus@users.noreply.github.com>
Date: Fri, 26 Oct 2018 14:08:06 +0200
Subject: [PATCH] Instructions how to get Shift/Reduce messages printed (Issue
 #258)

---
 docs/how_to_use.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/docs/how_to_use.md b/docs/how_to_use.md
index 95041e4..a76df2d 100644
--- a/docs/how_to_use.md
+++ b/docs/how_to_use.md
@@ -52,3 +52,18 @@ class MyTransformer(Transformer):
 new_tree = MyTransformer().transform(tree)
 ```
 
+## LALR usage
+
+By default Lark silently resolves Shift/Reduce conflicts as Shift. To enable warnings pass `debug=True`. To get the messages printed you have to configure `logging` framework beforehand. For example:
+
+```
+import logging
+logging.basicConfig(level=logging.DEBUG)
+
+collision_grammar = '''
+start: as as
+as: a*
+a: 'a'
+'''
+p = Lark(collision_grammar, parser='lalr', debug=True)
+```