How to find where the source code of an R function or package is installed?

I'm wondering where is the source of an R function or a package is.
For example, where is 'attributes'?

attributes
function (obj)  .Primitive("attributes")

I also do understand what .Primitive mean.
Looking below, it appears your understanding is different than mine.
Could somebody let me know
how to locate source file in an R installation?
Most R installations do not have the source code. But it is of course  
available.

https://svn.r-project.org/R/branches/R/src/main/
Why typing
'attributes' does not give its definition?
Because it's a .Primitive? ... which to me anyway means it is not  
implemented in R code.

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How to find where the source code of an R function or package is installed?

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