re-enable friendly exceptions to make map exception traces back to tree traces

Cython/Compiler/DebugFlags.py

@@ -10,7 +10,7 @@ debug_temp_code_comments = 0
 debug_trace_code_generation = 0
 
 # Do not replace exceptions with user-friendly error messages
-debug_no_exception_intercept = 1
+debug_no_exception_intercept = 0
 
 # Print a message each time a new stage in the pipeline is entered
 debug_verbose_pipeline = 0