As of R 2.10.0, call objects don't use a
srcref attribute
even if it's attached, see vignette("calls", package = "deparse") for
details. This class provides call objects that use their srcref
attribute for printing.
| 1 2 3 | srcref_call(call, srcref)
as.srcref_call(x, ...)
 | 
| call | call | 
| srcref | srcref | 
| x | object | 
| ... | passed to other methods | 
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