Add variations of empty span tests with whitespace omitted

Author: ratmice

cfgrammar/src/lib/yacc/parser.rs

@@ -2859,6 +2859,14 @@ Factor: ')' Expr ')';
             (
                 "%start Expr
 %%
+Expr:| Factor;
+Factor: ')' Expr ')';
+",
+                (0, Span::new(20, 20)),
+            ),
+            (
+                "%start Expr
+%%
 Expr: Factor | %empty;
 Factor: ')' Expr ')';
 ",
@@ -2872,6 +2880,14 @@ Factor: ')' Expr ')';
 ",
                 (1, Span::new(30, 30)),
             ),
+            (
+                "%start Expr
+%%
+Expr: Factor|;
+Factor: ')' Expr ')';
+",
+                (1, Span::new(28, 28)),
+            ),
         ];
 
         for (i, (src, (empty_pidx, empty_span))) in empty_prod_conflicts.iter().enumerate() {