Function condition_names_sexp 

pub(crate) fn condition_names_sexp() -> SEXP

Cached c("error", "kind", "class", "call", "data") names STRSXP for condition values.

Used by make_rust_condition_value which writes a 5-element list: the error message, kind, optional user-supplied custom class, optional R call, and an optional named-list data payload (NULL when absent).