+fn print_help_file_lines() {
+ println!(
+ "If you want to restrict reformatting to specific sets of lines, you can
+use the `--file-lines` option. Its argument is a JSON array of objects
+with `file` and `range` properties, where `file` is a file name, and
+`range` is an array representing a range of lines like `[7,13]`. Ranges
+are 1-based and inclusive of both end points. Specifying an empty array
+will result in no files being formatted. For example,
+
+```
+rustfmt --file-lines '[
+ {{\"file\":\"src/lib.rs\",\"range\":[7,13]}},
+ {{\"file\":\"src/lib.rs\",\"range\":[21,29]}},
+ {{\"file\":\"src/foo.rs\",\"range\":[10,11]}},
+ {{\"file\":\"src/foo.rs\",\"range\":[15,15]}}]'
+```
+
+would format lines `7-13` and `21-29` of `src/lib.rs`, and lines `10-11`,
+and `15` of `src/foo.rs`. No other files would be formatted, even if they
+are included as out of line modules from `src/lib.rs`."
+ );
+}
+