feat(protocol): implement From<(usize, usize)> for SourceSpan

README.md

@@ -104,14 +104,8 @@ fn pretend_this_is_main() -> Result<(), MyBad> {
     Err(MyBad {
         src: Arc::new(src),
         filename: "bad_file.rs".into(),
-        snip: SourceSpan {
+        snip: (0, (len - 1)).into(),
-            start: 0.into(),
+        bad_bit: (9, 12).into(),
-            end: (len - 1).into(),
-        },
-        bad_bit: SourceSpan {
-            start: 9.into(),
-            end: 12.into(),
-        },
     })
 }
 ```

src/protocol.rs

@@ -215,6 +215,15 @@ impl SourceSpan {
     }
 }
 
+impl From<(ByteOffset, ByteOffset)> for SourceSpan {
+    fn from((start, end): (ByteOffset, ByteOffset)) -> Self {
+        Self {
+            start: start.into(),
+            end: end.into(),
+        }
+    }
+}
+
 /**
 "Raw" type for the byte offset from the beginning of a [Source].
 */