I'm running R 1.1.0 for Windows; the behaviour is the same in 1.0.1.
# create a list containing an expression: no problem
x _ list(NA, expression(1))
# Try to assign an expression to a list element, and get an error:
x[[1]] _ expression(1)
# Try again with a named list element: no problem!
x _ list(a=NA,expression(1))
x$a _ expression(1)
The error message is:
Error in "[[<-"(*tmp*, 1, value = expression(1)) :
incompatible types
I think the error is in "[[<-", but that's a primitive, and I
don't
know how to track it down any further.
Duncan Murdoch
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