Avoid orphan in chain with punctuation

Author: topecongiro

src/imports.rs

@@ -127,13 +127,12 @@ fn compare_use_items(a: &ast::Item, b: &ast::Item) -> Ordering {
 
             // `extern crate foo as bar;`
             //                      ^^^ Comparing this.
-            let result = match (a_name, b_name) {
+            match (a_name, b_name) {
                 (Some(..), None) => Ordering::Greater,
                 (None, Some(..)) => Ordering::Less,
                 (None, None) => Ordering::Equal,
                 (Some(..), Some(..)) => a.ident.name.as_str().cmp(&b.ident.name.as_str()),
-            };
-            result
+            }
         }
         _ => unreachable!(),
     }

src/lib.rs

@@ -10,7 +10,6 @@
 
 #![feature(decl_macro)]
 #![feature(match_default_bindings)]
-#![feature(rustc_private)]
 #![feature(type_ascription)]
 
 #[macro_use]

src/utils.rs

@@ -178,7 +178,7 @@ pub fn last_line_extendable(s: &str) -> bool {
     }
     for c in s.chars().rev() {
         match c {
-            ')' | ']' | '}' | '?' | '>' => continue,
+            '(' | ')' | ']' | '}' | '?' | '>' => continue,
             '\n' => break,
             _ if c.is_whitespace() => continue,
             _ => return false,

tests/source/chains.rs

@@ -214,3 +214,18 @@ impl Foo {
         }).collect();
     }
 }
+
+// #2415
+// Avoid orphan in chain
+fn issue2415() {
+    let base_url = (|| {
+        // stuff
+
+        Ok((|| {
+            // stuff
+            Some(value.to_string())
+        })()
+           .ok_or("")?)
+    })()
+        .unwrap_or_else(|_: Box<::std::error::Error>| String::from(""));
+}

tests/target/chains.rs

@@ -246,3 +246,16 @@ impl Foo {
             .collect();
     }
 }
+
+// #2415
+// Avoid orphan in chain
+fn issue2415() {
+    let base_url = (|| {
+        // stuff
+
+        Ok((|| {
+            // stuff
+            Some(value.to_string())
+        })().ok_or("")?)
+    })().unwrap_or_else(|_: Box<::std::error::Error>| String::from(""));
+}