similar 2.2.1

A diff library for Rust
Documentation
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---
source: src/udiff.rs
expression: "&diff.unified_diff().missing_newline_hint(false).header(\"a.txt\",\n                                                        \"b.txt\").to_string()"
---
--- a.txt
+++ b.txt
@@ -1 +1 @@
-a
+b