Fixed examples for error reporting

examples/error_reporting_lalr.py

@@ -60,14 +60,14 @@ def parse(json_text):
 
 def test():
     try:
-        parse('{"key": "value"')
-    except JsonMissingClosing:
-        pass
+        parse('{"example1": "value"')
+    except JsonMissingClosing as e:
+        print(e)
 
     try:
-        parse('{"key": ] ')
-    except JsonMissingOpening:
-        pass
+        parse('{"example2": ] ')
+    except JsonMissingOpening as e:
+        print(e)
 
 
 if __name__ == '__main__':

lark/exceptions.py

@@ -13,7 +13,7 @@ class LexError(LarkError):
     pass
 
 class UnexpectedInput(LarkError):
-    def get_context(self, text, span=10):
+    def get_context(self, text, span=40):
         pos = self.pos_in_stream
         start = max(pos - span, 0)
         end = pos + span