style: rename grammar_start_symbols_set as grammar_start_symbols_add

[Akim Demaille]

commit d798851e48800f5c36c1a6be1392f465eca617a2
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Sun Nov 22 11:18:20 2020 +0100

    style: rename grammar_start_symbols_set as grammar_start_symbols_add
    
    * src/reader.h, src/reader.c (grammar_start_symbols_set): Rename as...
    (grammar_start_symbols_add): this.
    Adjust dependencies.

diff --git a/src/parse-gram.c b/src/parse-gram.c
index 872758ce..adda86af 100644
--- a/src/parse-gram.c
+++ b/src/parse-gram.c
@@ -2189,7 +2189,7 @@ yyreduce:
 
   case 34: /* grammar_declaration: "%start" symbols.1  */
     {
-      grammar_start_symbols_set ((yyvsp[0].yykind_90));
+      grammar_start_symbols_add ((yyvsp[0].yykind_90));
     }
     break;
 
diff --git a/src/parse-gram.y b/src/parse-gram.y
index ebebd89f..3f2c0147 100644
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -382,7 +382,7 @@ grammar_declaration:
   symbol_declaration
 | "%start" symbols.1
     {
-      grammar_start_symbols_set ($2);
+      grammar_start_symbols_add ($2);
     }
 | code_props_type "{...}" generic_symlist
     {
diff --git a/src/reader.c b/src/reader.c
index 7aabd835..17038b42 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -51,12 +51,9 @@ bool union_seen = false;
 /* Should rules have a default precedence?  */
 bool default_prec = true;
 
-/*-----------------------.
-| Set the start symbol.  |
-`-----------------------*/
 
 void
-grammar_start_symbols_set (symbol_list *syms)
+grammar_start_symbols_add (symbol_list *syms)
 {
   start_symbols = symbol_list_append (start_symbols, syms);
 }
diff --git a/src/reader.h b/src/reader.h
index b3431dca..c640dba0 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -49,7 +49,7 @@ extern symbol_list *start_symbols;
    foo.  */
 symbol *switching_token (const symbol *start);
 
-void grammar_start_symbols_set (symbol_list *syms);
+void grammar_start_symbols_add (symbol_list *syms);
 
 void grammar_current_rule_begin (symbol *lhs, location loc,
                                  named_ref *lhs_named_ref);