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def function(foo):
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lang-c
__FUNCTION__is that it's not portable, note that many compilers have a similar feature, just sometimes with a different name. It's been standardized to__func__in C99.__FUNCTION__and__func__don't actually use the preprocessor (because the preprocessor does not understand C syntax and can't identify function declarations). In effect they're compiler intrinsics. Proof: rungcc -Eon the code, look at the output.