body-from:header — ordinary primitive
( pfa -- cfa )(
trying to convert a pointer to the parameter-field (PFA) to point then to the corresponding code-field (CFA) - note that this is not necessarily the inverse of >BODY instead it is a fast implementation assuming a VARIABLE thing had been used. Every use of "BODY>" is warned in the logfile.
implementation-specific simulation: : BODY> CELL - ;