olivroy commented on code in PR #50525:
URL: https://github.com/apache/arrow/pull/50525#discussion_r3704948030


##########
r/R/util.R:
##########
@@ -30,14 +30,135 @@ oxford_paste <- function(x, conjunction = "and", quote = 
TRUE, quote_symbol = '"
   }
 }
 
-assert_is <- function(object, class) {
-  msg <- paste(substitute(object), "must be a", oxford_paste(class, "or"))
-  assert_that(inherits(object, class), msg = msg)
+check_null <- function(x, msg = NULL, call = rlang::caller_env()) {
+  if (!is.null(x)) {
+    if (is.null(msg)) {
+      rlang::stop_input_type(
+        x,
+        what = "NULL",
+        call = call
+      )
+    } else {
+      abort(msg, call = call)
+    }
+  }
+}
+
+# copied from 
https://github.com/r-lib/rlang/blob/main/R/standalone-types-check.R
+# they are not licensed.

Review Comment:
   This comes from rlang. 
https://github.com/r-lib/rlang/blob/main/R/standalone-types-check.R I copied 2 
functions from there. But the file is marked as unlicensed, which allows you to 
copy freely.



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