Deprecated.

These functions are deprecated. They will be removed in future. Please use the functions in setkey.

set2key(...)      #  DEPRECATED; helpful error since May 2018 and warning since Nov 2016
set2keyv(...)     #  DEPRECATED; helpful error since May 2018 and warning since Nov 2016
key2(...)         #  DEPRECATED; helpful error since May 2018 and warning since Nov 2016
key(x) <- value   #  warning since 2012; DEPRECATED since Mar 2019

Arguments

...	Deprecated.
x	Deprecated.
value	Deprecated.