Add empty unraisablehook

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/BuiltinNames.java

@@ -59,6 +59,7 @@ public abstract class BuiltinNames {
     public static final String DISPLAYHOOK = "displayhook";
     public static final String BREAKPOINTHOOK = "breakpointhook";
     public static final String EXCEPTHOOK = "excepthook";
+    public static final String UNRAISABLEHOOK = "unraisablehook";
     public static final String LAST_TYPE = "last_type";
     public static final String LAST_VALUE = "last_value";
     public static final String LAST_TRACEBACK = "last_traceback";

graalpython/lib-graalpython/sys.py

@@ -199,6 +199,19 @@ def __print_traceback__(typ, value, tb):
 del make_excepthook
 
 
+def make_unraisablehook():
+    def __unraisablehook__(unraisable, /):
+        # We don't currently use it and there's no way to construct the parameter in python code (internal type)
+        pass
+
+    return __unraisablehook__
+
+
+__unraisablehook__ = make_unraisablehook()
+unraisablehook = __unraisablehook__
+del make_unraisablehook
+
+
 @__graalpython__.builtin
 def breakpointhook(*args, **kws):
     import importlib, os, warnings