From 403f943bb494b7bf1e29f8921ced304ca6ae1f22 Mon Sep 17 00:00:00 2001
From: David Calavera <david.calavera@gmail.com>
Date: Fri, 23 Jul 2010 19:48:10 +0200
Subject: [PATCH] fix BigDecimal.new starting with underscores

---
 src/org/jruby/RubyBigDecimal.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/org/jruby/RubyBigDecimal.java b/src/org/jruby/RubyBigDecimal.java
index 226a42a6957..1f838becb66 100644
--- a/src/org/jruby/RubyBigDecimal.java
+++ b/src/org/jruby/RubyBigDecimal.java
@@ -383,7 +383,10 @@ public static RubyBigDecimal newInstance(IRubyObject recv, IRubyObject[] args) {
             // by Java's BigDecimal. Not terribly efficient for now.
             // 1. MRI allows d and D as exponent separators
             strValue = strValue.replaceFirst("[dD]", "E");
-            // 2. MRI allows underscores anywhere
+            // 2. MRI allows underscores anywhere but in the beginning
+            if (strValue.startsWith("_")) {
+                return newZero(runtime, 1);
+            }
             strValue = strValue.replaceAll("_", "");
             // 3. MRI ignores the trailing junk
             strValue = NUMBER_PATTERN.matcher(strValue).replaceFirst("$1");