From 599bf45ac9afc309332388fe4bc42a100e3d1586 Mon Sep 17 00:00:00 2001
From: Theo Belaire <theo.belaire@gmail.com>
Date: Fri, 1 May 2015 21:13:27 +0200
Subject: [PATCH] Indent code past the widest line number

Fixes #11715
---
 src/libsyntax/diagnostic.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/libsyntax/diagnostic.rs b/src/libsyntax/diagnostic.rs
index 14dd9978b876..6c2e3dc6330e 100644
--- a/src/libsyntax/diagnostic.rs
+++ b/src/libsyntax/diagnostic.rs
@@ -594,12 +594,18 @@ fn highlight_lines(err: &mut EmitterWriter,
     let display_line_infos = &lines.lines[..display_lines];
     let display_line_strings = &line_strings[..display_lines];
 
+    // Calculate the widest number to format evenly and fix #11715
+    assert!(display_line_infos.len() > 0);
+    let mut max_line_num = display_line_infos[display_line_infos.len() - 1].line_index + 1;
+    let mut digits = 0;
+    while max_line_num > 0 { max_line_num /= 10; digits += 1; }
     // Print the offending lines
     for (line_info, line) in display_line_infos.iter().zip(display_line_strings) {
-        try!(write!(&mut err.dst, "{}:{} {}\n",
+        try!(write!(&mut err.dst, "{}:{:>width$} {}\n",
                     fm.name,
                     line_info.line_index + 1,
-                    line));
+                    line,
+                    width=digits));
     }
 
     // If we elided something, put an ellipsis.