TP0233

Error: can’t be used in a native program (M23)

Messages

a native program can't use Python, with help build it without '--native'
'<T>.<m>' can't be used in a native program: <message> (M23)
a Python extension can't use Python interop itself (M25)
an extension module can only pass Python objects along, with help do this in Python, and pass the result (M45)

Example

From the golden case tests/cases/m25/tp0233_extension.tpn:

# An extension module runs natively, so it can't use Python interop itself (SPEC §17.1).
from python import json

def dump(n: int) -> str:
    return json.dumps(n) as str

The compiler reports:

tp0233_extension.tpn:2:1: error TP0233: a Python extension can't use Python interop itself

The specification lists every code.