commit bash-20200403 snapshot

doc/bash.1

@@ -1819,6 +1819,10 @@ subsequently reset.
 .B HISTCMD
 The history number, or index in the history list, of the current
 command.
+Assignments to
+.SM
+.B HISTCMD
+are ignored.
 If
 .SM
 .B HISTCMD

doc/bashref.texi

@@ -6081,6 +6081,7 @@ parser to treat the rest of the line as a comment.
 @item HISTCMD
 The history number, or index in the history list, of the current
 command.
+Assignments to @env{HISTCMD} are ignored.
 If @env{HISTCMD}
 is unset, it loses its special properties,
 even if it is subsequently reset.