Properly interpolate sloc here (pytorch#137088)

Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: pytorch#137088
Approved by: https://github.com/Skylion007

torch/fx/experimental/symbolic_shapes.py

@@ -5494,7 +5494,7 @@ def _make_data_dependent_error(
             f"{desc} {expr} (unhinted: {unhinted_expr}).  "
             f"(Size-like symbols: {', '.join(map(str, size_like_symbols)) or 'none'})\n\n"
             f"{size_oblivious_result_msg}"
-            "Caused by: {sloc}\n"
+            f"Caused by: {sloc}\n"
             'For more information, run with TORCH_LOGS="dynamic"\n'
             "For extended logs when we create symbols, also add "
             f"TORCHDYNAMO_EXTENDED_DEBUG_CREATE_SYMBOL=\"{','.join(map(str, expr.free_symbols))}\"\n"