Dear all, I was playing around with some C code that inspects argument promises and I noticed that forwarded arguments sometimes contain bytecode in the PRCODE component. E.g. if I have a nested call like this:
f <- function(x) x g <- function(x) f(x) g(1+1) and inspect the value of “x” in g’s frame from within f’s frame (basically calling findVar(parent.frame(), x)), I would see a LANGSXP the first time g() is invoked, but BCODESXP on every subsequent time. Using PREXPR gets me the original LANGSXP in any case. Now, this is curious behavior and I had a quick glance into R source code related to closure evaluation and argument matching, but I could not see anything that would generate bytecode for promises. Could someone with in-depth knowledge of R’s machinery explain what is going on? Thanks, Taras ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
