From f0519c8001329df8e0ee798ddd593bac236e543a Mon Sep 17 00:00:00 2001
From: topecongiro <seuchida@gmail.com>
Date: Mon, 19 Feb 2018 12:36:36 +0900
Subject: [PATCH] Avoid running lookup_line_range when file_lines are not
 specified

---
 rustfmt-config/src/file_lines.rs | 5 +++++
 rustfmt-core/src/utils.rs        | 9 +++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/rustfmt-config/src/file_lines.rs b/rustfmt-config/src/file_lines.rs
index 87e201345de..714f33c03dc 100644
--- a/rustfmt-config/src/file_lines.rs
+++ b/rustfmt-config/src/file_lines.rs
@@ -132,6 +132,11 @@ pub fn all() -> FileLines {
         FileLines(None)
     }
 
+    /// Returns true if this `FileLines` contains all lines in all files.
+    pub fn is_all(&self) -> bool {
+        self.0.is_none()
+    }
+
     pub fn from_ranges(mut ranges: HashMap<FileName, Vec<Range>>) -> FileLines {
         normalize_ranges(&mut ranges);
         FileLines(Some(ranges))
diff --git a/rustfmt-core/src/utils.rs b/rustfmt-core/src/utils.rs
index d1bb7e26f5e..20b30089d70 100644
--- a/rustfmt-core/src/utils.rs
+++ b/rustfmt-core/src/utils.rs
@@ -278,10 +278,11 @@ pub fn mk_sp(lo: BytePos, hi: BytePos) -> Span {
 // Return true if the given span does not intersect with file lines.
 macro_rules! out_of_file_lines_range {
     ($self: ident, $span: expr) => {
-        !$self
-            .config
-            .file_lines()
-            .intersects(&$self.codemap.lookup_line_range($span))
+        !$self.config.file_lines().is_all()
+            && !$self
+                .config
+                .file_lines()
+                .intersects(&$self.codemap.lookup_line_range($span))
     };
 }
 
-- 
2.44.0