Dear R-devel, In a package of mine, I use removeSource on expression objects in order to make expressions that are semantically the same serialize to the same byte sequences: https://github.com/cran/depcache/blob/854d68a/R/fixup.R#L8-L34
Today I learned that expressions containing function definitions also contain the source references for the functions, not as an attribute, but as a separate argument to the `function` call: str(quote(function() NULL)[[4]]) # 'srcref' int [1:8] 1 11 1 25 11 25 1 1 # - attr(*, "srcfile")=Classes 'srcfilecopy', 'srcfile' # <environment:0x55aba55a8a50> This means that removeSource() on an expression that would define a function when evaluated doesn't actually remove the source reference from the object. Do you think it would be appropriate to teach removeSource() to remove such source references? What could be a good way to implement that? if (is.call(fn) && identical(fn[[1]], 'function')) fn[[4]] <- NULL sounds too arbitrary. if (inherits(fn, 'srcref')) return(NULL) sounds too broad. -- Best regards, Ivan ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
