[Truffle] Fixed a problem with format strings and literal '%'.

jruby · Jan 15, 2015 · 6a96437 · 6a96437
1 parent bf361d9
commit 6a96437
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/core/src/main/java/org/jruby/truffle/runtime/core/StringFormatter.java b/core/src/main/java/org/jruby/truffle/runtime/core/StringFormatter.java
@@ -187,7 +187,10 @@ public static void format(RubyContext context, PrintStream stream, String format
                         throw new RuntimeException("Kernel#sprintf error -- unknown format: " + type);
                 }
 
-                v++;
+                // Showing a literal '%' would not reference any particular value, so don't increment the value lookup index.
+                if (type != '%') {
+                    v++;
+                }
             } else {
                 stream.print(c);
             }