obj_size kills R session if asked to measure size of an object with linear models about lobstr

[hadley]

Also crashes for me

[hadley]

Simpler reprex:

df <- data.frame(g = 1:2, y = runif(10), x = runif(10))
mod <- lm(y ~ x, data = df)

lobstr::obj_size(mod$residuals)

[hadley]

Even simpler:

lobstr::obj_size(names(mod$residuals))

I think this is something to do with:

> .Internal(inspect(names(resid)))
@7f98e5ebef60 16 STRSXP g1c0 [MARK,NAM(3)]   <expanded string conversion>
  @7f98db7dab98 16 STRSXP g1c5 [MARK] (len=10, tl=0)
    @7f98d8846fe8 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "1"
    @7f98d91b37a8 09 CHARSXP g1c1 [MARK,gp=0x60] [ASCII] [cached] "2"
    @7f98dba4a570 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "3"
    @7f98dce61030 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "4"
    @7f98dbcb5f08 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "5"
    ...

[hadley]

Implementation at https://github.com/wch/r-source/blob/1570b0e3b56e7d51ca8e18fcd7b8b7fab7aff109/src/main/altclasses.c#L586

[hadley]

Root cause is probably because it doesn't contain a valid pairlist: https://github.com/wch/r-source/blob/1570b0e3b56e7d51ca8e18fcd7b8b7fab7aff109/src/main/altclasses.c#L598

[hadley]

Fixed in c34bd45