My first Reprex!

[Andrea Gilardi]

f1 <- function(x, w = 1) f2(x, w)
f2 <- function(x, w = 2) f3(x, w)
f3 <- function(x, w = 3) sum(x) + w
f1(x = "ABC")
#> Error in sum(x): invalid 'type' (character) of argument

^{Created on 2023-03-23 with reprex v2.0.2}