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This warning was happening to dependent packages on R CMD check.
The problem is due to delayedAssign; it appears this can't be used safely, at least not to define package-level symbols that contain S4 or reference class objects.
If you call this in a package's .R file:
`delayedAssign("hello", stop("boom"))`
but don't refer to "hello" anywhere, when you run R CMD check on a dependent package you'll see the error.
If the expression needs the methods package (like Context$new()), you'll get an error unless the dependent package itself depends on methods.