From 49cae9c48566a37dd4e8bcab69c8598dc0343ee9 Mon Sep 17 00:00:00 2001
From: Sinh Pham <phamansinh@gmail.com>
Date: Sat, 22 Aug 2015 18:08:11 -0400
Subject: [PATCH] Fix https://github.com/nrc/rustfmt/issues/190

---
 src/missed_spans.rs                   | 4 ++++
 tests/target/no_new_line_beginning.rs | 2 ++
 2 files changed, 6 insertions(+)
 create mode 100644 tests/target/no_new_line_beginning.rs

diff --git a/src/missed_spans.rs b/src/missed_spans.rs
index 64025550410..aa1d4679e9a 100644
--- a/src/missed_spans.rs
+++ b/src/missed_spans.rs
@@ -43,6 +43,10 @@ impl<'a> FmtVisitor<'a> {
                self.codemap.lookup_char_pos(end));
 
         if start == end {
+            // Do nothing if this is the beginning of the file.
+            if start == BytePos(0) {
+                return;
+            }
             process_last_snippet(self, "", "");
             return;
         }
diff --git a/tests/target/no_new_line_beginning.rs b/tests/target/no_new_line_beginning.rs
new file mode 100644
index 00000000000..f79c691f085
--- /dev/null
+++ b/tests/target/no_new_line_beginning.rs
@@ -0,0 +1,2 @@
+fn main() {
+}