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# Test that we can raise and catch (preallocated) exception
# without memory allocation.
import micropython
e = ValueError("error")
def func():
micropython.heap_lock()
try:
# This works as is because traceback is not allocated
# if not possible (heap is locked, no memory). If heap
# is not locked, this would allocate a traceback entry.
# To avoid that, traceback should be warmed up (by raising
# it once after creation) and then cleared before each
# raise with:
# e.__traceback__ = None
raise e
except Exception as e2:
print(e2)
micropython.heap_unlock()
func()
print("ok")
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