problem with "[[<-"

[Saikat DebRoy]

This works in 0.65.1 but not in 0.90.0.

> form <- ~ a | b
> form[[2]][[3]] <- as.name("u")
Error: Object "u" not found

I can get around this as follows

> form.1 <- form[[2]]
> form.1[[3]] <- as.name("u")
> form[[2]] <- form.1
> form
~a | u

--please do not edit the information below--

Version:
 platform = i686-unknown-linux
 arch = i686
 os = linux
 system = i686, linux
 status = Under development (unstable)
 major = 0
 minor = 90.0
 year = 1999
 month = October
 day = 28
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base
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