Help: Clarify that ARGV# beyond ARGC will have an undefined behavior (#15380)

0 files changed, 0 insertions, 0 deletions
diff --git a/Help/command/function.rst b/Help/command/function.rst
index 5bbffbf..7ffdfee 100644
--- a/Help/command/function.rst
+++ b/Help/command/function.rst
@@ -24,6 +24,10 @@ This facilitates creating functions with optional arguments.
 Additionally ``ARGV`` holds the list of all arguments given to the
 function and ``ARGN`` holds the list of arguments past the last expected
 argument.
+Referencing to ``ARGV#`` arguments beyond ``ARGC`` have undefined
+behavior. Checking that ``ARGC`` is greater than ``#`` is the only way
+to ensure that ``ARGV#`` was passed to the function as an extra
+argument.
 
 A function opens a new scope: see :command:`set(var PARENT_SCOPE)` for
 details.
diff --git a/Help/command/macro.rst b/Help/command/macro.rst