Always use lexical-binding in lisp-interaction-mode (bug#38835)

* lisp/progmodes/elisp-mode.el (lisp-interaction-mode):
Set lexical-binding.
* lisp/startup.el (command-line, startup--get-buffer-create-scratch):
Don't set lexical-binding here.
* doc/lispref/variables.texi:
* etc/NEWS:
Make it clear that lisp-interaction-mode uses lexical-binding.

1 files changed, 3 insertions, 0 deletions

diff --git a/doc/lispref/variables.texi b/doc/lispref/variables.texi
index 1ec97e2f3de..1e357754abe 100644
--- a/doc/lispref/variables.texi
+++ b/doc/lispref/variables.texi
@@ -1187,6 +1187,9 @@ When evaluating Emacs Lisp code directly using an @code{eval} call,
 lexical binding is enabled if the @var{lexical} argument to
 @code{eval} is non-@code{nil}.  @xref{Eval}.
 
+Lexical binding is also enabled in Lisp Interaction and IELM
+mode, used in the @file{*scratch*} and @file{*ielm*} buffers.
+
 @cindex special variables
   Even when lexical binding is enabled, certain variables will
 continue to be dynamically bound.  These are called @dfn{special