Note that assignments to __debug__ are illegal

jeremyhylton · jeremyhylton · commit 2c84fc8a7dae · 2001-03-23T14:34:06.000Z
diff --git a/Doc/ref/ref6.tex b/Doc/ref/ref6.tex
@@ -86,6 +86,8 @@ \section{Assert statements \label{assert}}
 the source code for the expression that failed in the error message;
 it will be displayed as part of the stack trace.
 
+Assignments to \code{__debug__} are illegal.  The value for the
+built-in variable is determined when the interpreter starts.
 
 \section{Assignment statements \label{assignment}}
 
