added parseable line number and col number

src/black/__init__.py

@@ -701,7 +701,7 @@ def reformat_code(
     except Exception as exc:
         if report.verbose:
             traceback.print_exc()
-        report.failed(path, str(exc))
+        report.failed(path, None, None, str(exc))
 
 
 # diff-shades depends on being to monkeypatch this function to operate. I know it's
@@ -755,7 +755,7 @@ def reformat_one(
     except Exception as exc:
         if report.verbose:
             traceback.print_exc()
-        report.failed(src, str(exc))
+        report.failed(src, None, None, str(exc))
 
 
 # diff-shades depends on being to monkeypatch this function to operate. I know it's
@@ -861,7 +861,7 @@ async def schedule_formatting(
             if task.cancelled():
                 cancelled.append(task)
             elif task.exception():
-                report.failed(src, str(task.exception()))
+                report.failed(src, None, None, str(task.exception()))
             else:
                 changed = Changed.YES if task.result() else Changed.NO
                 # If the file was written back or was successfully checked as

src/black/report.py

@@ -48,9 +48,13 @@ def done(self, src: Path, changed: Changed) -> None:
                 out(msg, bold=False)
             self.same_count += 1
 
-    def failed(self, src: Path, message: str) -> None:
+    def failed(self, src: Path, lineno: int, column: int, message: str) -> None:
         """Increment the counter for failed reformatting. Write out a message."""
-        err(f"error: cannot format {src}: {message}")
+        if lineno and column:
+            path_line_col=f"{src}:{lineno}:{column}"
+        else:
+            path_line_col=f"{src}"
+        err(f"error: cannot format {path_line_col}: {message}")
         self.failure_count += 1
 
     def path_ignored(self, path: Path, message: str) -> None: