Improve parse error readability

src/black/parsing.py

@@ -80,16 +80,26 @@ def lib2to3_parse(
                 faulty_line = lines[lineno - 1]
             except IndexError:
                 faulty_line = "<line number missing in source>"
-            errors[grammar.version] = InvalidInput(
-                f"Cannot parse{tv_str}: {lineno}:{column}: {faulty_line}"
-            )
+            error_msg = (
+                            f"Cannot parse{tv_str}: {lineno}:{column}\n"
+                            f"    {faulty_line}\n"
+                            f"    {' ' * (column - 1)}^\n"
+                                "SyntaxError: invalid syntax"
+                        )
+
+            errors[grammar.version] = InvalidInput(error_msg)
 
         except TokenError as te:
             # In edge cases these are raised; and typically don't have a "faulty_line".
             lineno, column = te.args[1]
-            errors[grammar.version] = InvalidInput(
-                f"Cannot parse{tv_str}: {lineno}:{column}: {te.args[0]}"
-            )
+            error_msg = (
+                            f"Cannot parse{tv_str}: {lineno}:{column}\n"
+                            f"    {te.args[0]}\n"
+                            f"    {' ' * (column - 1)}^\n"
+                                "SyntaxError: invalid syntax"
+                        )
+
+        errors[grammar.version] = InvalidInput(error_msg)
 
     else:
         # Choose the latest version when raising the actual parsing error.