[GR-47875] Avoid printing exceptions to System.err

PullRequest: graalpython/2910

Author: lukasstadler

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/PythonAbstractObject.java

@@ -530,12 +530,6 @@ public Object execute(Object[] arguments,
         boolean mustRelease = gil.acquire();
         try {
             return executeNode.execute(this, arguments);
-        } catch (PException e) {
-            throw e;
-        } catch (Throwable e) {
-            CompilerDirectives.transferToInterpreter();
-            e.printStackTrace();
-            throw e;
         } finally {
             gil.release(mustRelease);
         }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/CApiContext.java

@@ -46,6 +46,7 @@
 import static com.oracle.graal.python.nodes.StringLiterals.J_NFI_LANGUAGE;
 
 import java.io.IOException;
+import java.io.PrintStream;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -674,7 +675,8 @@ Object execute(Object[] arguments) {
                 LOGGER.finer("CApiContext.GetBuiltin " + id + " / " + builtin.name());
                 return builtin;
             } catch (Throwable e) {
-                e.printStackTrace();
+                // this is a fatal error, so print it to stderr:
+                e.printStackTrace(new PrintStream(PythonContext.get(null).getEnv().err()));
                 throw new RuntimeException(e);
             }
         }