R Under development (unstable) (2024-06-16 r86763 ucrt) -- "Unsuffered Consequences"
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> #'   tests/fmla.R
> #'
> #'   Manipulation of formulae
> 
> require(spatstat.utils)
Loading required package: spatstat.utils
> 
> #'  code coverage of special cases
> identical.formulae(y ~ x, NULL)
[1] FALSE
> termsinformula(NULL)
character(0)
> offsetsinformula(y ~ x)
character(0)
> lhs.of.formula(~x)
NULL
> rhs.of.formula(y ~ x, tilde=FALSE)
x
> f <- ~x
> lhs.of.formula(f) <- quote(y)
> print(f)
y ~ x
> can.be.formula("y ~ x")
[1] TRUE
> 
> 
> proc.time()
   user  system elapsed 
   0.15    0.06    0.15