fix: improve error messages (#1276)

Signed-off-by: Louis Mandel <[email protected]>

Author: mandel

src/pdl/pdl_interpreter.py

@@ -614,8 +614,12 @@ def process_advance_block_retry(  # noqa: C901
             if do_retry:
                 err_msg = traceback.format_exc()
                 error = f"An error occurred in a PDL block. Error details: {err_msg}"
+                if loc is None:
+                    message = error
+                else:
+                    message = get_loc_string(loc) + error
                 print(
-                    f"\n\033[0;31m[Retry {trial_idx+1}/{max_retry}] {error}\033[0m\n",
+                    f"\n\033[0;31m[Retry {trial_idx+1}/{max_retry}] {message}\033[0m\n",
                     file=sys.stderr,
                 )
                 if block.trace_error_on_retry:

src/pdl/pdl_stdlib.pdl

@@ -80,8 +80,8 @@ defs:
       retry: 3
       fallback:
         lang: python
-        code: 
-          raise Exception("Llm-as-judge failed!")
+        code: |
+          raise Exception(f"Llm-as-judge failed!\n judge prompt: {prompt}")
 
   get_judge_prompt:
     function: