Work around reader limitations for old-style backquotes.

See Bug#28759.

* admin/grammars/make.by: Escape ,@ to avoid old-style backquote
detection

1 files changed, 12 insertions, 7 deletions

diff --git a/admin/grammars/make.by b/admin/grammars/make.by
index d3a03ead472..4d029186d86 100644
--- a/admin/grammars/make.by
+++ b/admin/grammars/make.by
@@ -54,15 +54,20 @@
 
 %%
 
+;; Escape the ,@ below because the reader doesn't correctly detect
+;; old-style backquotes for this case.  The backslashes can be removed
+;; once old-style backquotes are completely gone (probably in
+;; Emacs 28).
+
 Makefile : bol newline (nil)
          | bol variable
-           ( ,@$2 )
+           ( \,@$2 )
          | bol rule
-           ( ,@$2 )
+           ( \,@$2 )
          | bol conditional
-           ( ,@$2 )
+           ( \,@$2 )
          | bol include
-           ( ,@$2 )
+           ( \,@$2 )
          | whitespace ( nil )
          | newline ( nil )
          ;
@@ -125,13 +130,13 @@ colons: COLON COLON ()
       ;
 
 element-list: elements newline
-              ( ,@$1 )
+              ( \,@$1 )
             ;
 
 elements: element some-whitespace elements
-          ( ,@$1 ,@$3 )
+          ( \,@$1 ,@$3 )
         | element
-          ( ,@$1 )
+          ( \,@$1 )
         | ;;EMPTY
         ;