Require non-alphanum leading up to a path replacement

src/normalize.rs

@@ -320,14 +320,24 @@ fn replace_case_insensitive(line: &str, pattern: &str, replacement: &str) -> Str
     let line_lower = line_lower.as_str();
     let mut split = line_lower.split(&pattern_lower);
     let mut pos = 0;
+    let mut insert_replacement = false;
     while let Some(keep) = split.next() {
-        if !replaced.is_empty() {
+        if insert_replacement {
             replaced.push_str(replacement);
             pos += pattern.len();
         }
         let keep = &line[pos..pos + keep.len()];
         replaced.push_str(keep);
         pos += keep.len();
+        insert_replacement = true;
+        if replaced.ends_with(|ch: char| ch.is_ascii_alphanumeric()) {
+            if let Some(ch) = line[pos..].chars().next() {
+                replaced.push(ch);
+                pos += ch.len_utf8();
+                split = line_lower[pos..].split(&pattern_lower);
+                insert_replacement = false;
+            }
+        }
     }
 
     replaced

src/tests.rs

@@ -263,7 +263,7 @@ Additional crates such as `pyo3-asyncio` can be used to integrate async Rust and
 " "
 error: `async fn` is not yet supported for Python functions.
 
-Additional crates such as `pyo3-asyncio` can be used to integrate async Rust and Python. For more information, see https://github.com$DIR$WORKSPACE/issues/1632
+Additional crates such as `pyo3-asyncio` can be used to integrate async Rust and Python. For more information, see https://github.com/PyO3/pyo3/issues/1632
   --> tests/ui/invalid_pyfunctions.rs:10:1
    |
 10 | async fn async_function() {}