The type of expression objects
EXPRSXP.Rd
EXPRSXP is an object-like macro defining the SEXPTYPE
type of expression objects.
Declaration
#define EXPRSXP 20 /* expressions vectors */
In Rinternals.h.
References
https://cran.r-project.org/doc/manuals/r-patched/R-ints.html#SEXPTYPEs