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bind makes each procedure it goes into read-only and ignores read-only procedures (PLRM 3rd ed., bind). The reader bound them again, so a prolog that binds a procedure holding an earlier-bound one, after defining a name such as M as an operator, turned that procedure's own variable M into setmiterlimit. Ghostscript's eps2write prolog does this, and its files with sampled functions (transfer, black generation) failed to open.