fix: include original line number in checkstyle output

Author: calebcartwright

src/emitter/checkstyle.rs

@@ -52,8 +52,11 @@ where
             if let DiffLine::Expected(message) = line {
                 write!(
                     writer,
-                    r#"<error line="{}" severity="warning" message="Should be `{}`" />"#,
+                    r#"<error {}="{}" {}="{}" severity="warning" message="Should be `{}`" />"#,
+                    "line",
                     mismatch.line_number,
+                    "original_line",
+                    mismatch.line_number_orig,
                     XmlEscaped(&message)
                 )?;
             }

tests/writemode/target/checkstyle.xml

@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="utf-8"?>
-<checkstyle version="4.3"><file name="tests/writemode/source/fn-single-line.rs"><error line="2" severity="warning" message="Should be `fn foo_expr() { 1 }`" /><error line="2" severity="warning" message="Should be `fn foo_stmt() { foo(); }`" /><error line="2" severity="warning" message="Should be `fn foo_decl_local() { let z = 5; }`" /><error line="2" severity="warning" message="Should be `fn foo_decl_item(x: &amp;mut i32) { x = 3; }`" /><error line="2" severity="warning" message="Should be `fn empty() {}`" /><error line="2" severity="warning" message="Should be `fn foo_return() -&gt; String { &quot;yay&quot; }`" /><error line="2" severity="warning" message="Should be `fn foo_where() -&gt; T`" /><error line="2" severity="warning" message="Should be `where`" /><error line="2" severity="warning" message="Should be `    T: Sync,`" /><error line="2" severity="warning" message="Should be `{`" /><error line="52" severity="warning" message="Should be `fn lots_of_space() { 1 }`" /><error line="59" severity="warning" message="Should be `    fn dummy(&amp;self) {}`" /><error line="59" severity="warning" message="Should be `trait CoolerTypes {`" /><error line="59" severity="warning" message="Should be `    fn dummy(&amp;self) {}`" /><error line="59" severity="warning" message="Should be `fn Foo&lt;T&gt;()`" /><error line="59" severity="warning" message="Should be `where`" /><error line="59" severity="warning" message="Should be `    T: Bar,`" /><error line="59" severity="warning" message="Should be `{`" /></file></checkstyle>
+<checkstyle version="4.3"><file name="tests/writemode/source/fn-single-line.rs"><error line="2" original_line="2" severity="warning" message="Should be `fn foo_expr() { 1 }`" /><error line="2" original_line="2" severity="warning" message="Should be `fn foo_stmt() { foo(); }`" /><error line="2" original_line="2" severity="warning" message="Should be `fn foo_decl_local() { let z = 5; }`" /><error line="2" original_line="2" severity="warning" message="Should be `fn foo_decl_item(x: &amp;mut i32) { x = 3; }`" /><error line="2" original_line="2" severity="warning" message="Should be `fn empty() {}`" /><error line="2" original_line="2" severity="warning" message="Should be `fn foo_return() -&gt; String { &quot;yay&quot; }`" /><error line="2" original_line="2" severity="warning" message="Should be `fn foo_where() -&gt; T`" /><error line="2" original_line="2" severity="warning" message="Should be `where`" /><error line="2" original_line="2" severity="warning" message="Should be `    T: Sync,`" /><error line="2" original_line="2" severity="warning" message="Should be `{`" /><error line="52" original_line="61" severity="warning" message="Should be `fn lots_of_space() { 1 }`" /><error line="59" original_line="70" severity="warning" message="Should be `    fn dummy(&amp;self) {}`" /><error line="59" original_line="70" severity="warning" message="Should be `trait CoolerTypes {`" /><error line="59" original_line="70" severity="warning" message="Should be `    fn dummy(&amp;self) {}`" /><error line="59" original_line="70" severity="warning" message="Should be `fn Foo&lt;T&gt;()`" /><error line="59" original_line="70" severity="warning" message="Should be `where`" /><error line="59" original_line="70" severity="warning" message="Should be `    T: Bar,`" /><error line="59" original_line="70" severity="warning" message="Should be `{`" /></file></checkstyle>