diagnostics: improve the accuracy for %error-verbose

Avoid duplicate warnings about %error-verbose, once for deprecation,
another for duplicate.  Keep only the duplicate warning for the second
occurrence of %error-verbose.

This will help removal fixits.

* src/scan-gram.l (%error-verbose): Return as a PERCENT_ERROR_VERBOSE
token.
* src/parse-gram.y (do_error_verbose): New.
Use it.
* src/muscle-tab.c (muscle_percent_variable_update): Handle pseudo
variables such as %error-verbose.

src/muscle-tab.c

@@ -446,6 +446,8 @@ muscle_percent_variable_update (char const *variable,
   } conversion_type;
   const conversion_type conversion[] =
   {
+    { "%error-verbose",             "parse.error=verbose",       muscle_keyword },
+    { "%error_verbose",             "parse.error=verbose",       muscle_keyword },
     { "abstract",                   "api.parser.abstract",       muscle_keyword },
     { "annotations",                "api.parser.annotations",    muscle_code },
     { "api.push_pull",              "api.push-pull",             muscle_keyword },
@@ -477,7 +479,9 @@ muscle_percent_variable_update (char const *variable,
           : STREQ (c->obsolete, variable))
         {
           /* Generate the deprecation warning. */
-          *old = define_directive (c->obsolete, kind, *value);
+          *old = c->obsolete[0] == '%'
+            ? xstrdup (c->obsolete)
+            : define_directive (c->obsolete, kind, *value);
           *upd = define_directive (c->updated, c->kind, *value);
           /* Update the variable and its value.  */
           {

src/parse-gram.y

@@ -82,6 +82,9 @@
      string from the scanner (should be CODE). */
   static char const *translate_code_braceless (char *code, location loc);
 
+  /* Handle a %error-verbose directive.  */
+  static void do_error_verbose (location const *loc, char const *directive);
+
   /* Handle a %name-prefix directive.  */
   static void do_name_prefix (location const *loc,
                               char const *directive, char const *value);
@@ -151,6 +154,7 @@
   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"
   PERCENT_DEFINES         "%defines"
+  PERCENT_ERROR_VERBOSE   "%error-verbose"
   PERCENT_EXPECT          "%expect"
   PERCENT_EXPECT_RR       "%expect-rr"
   PERCENT_FLAG            "%<flag>"
@@ -196,7 +200,8 @@
 %printer { fprintf (yyo, "{\n%s\n}", $$); } <char*>
 
 %type <uniqstr>
-  BRACKETED_ID ID ID_COLON PERCENT_FLAG PERCENT_NAME_PREFIX TAG
+  BRACKETED_ID ID ID_COLON
+  PERCENT_ERROR_VERBOSE PERCENT_FLAG PERCENT_NAME_PREFIX TAG
   tag tag.opt variable
 %printer { fputs ($$, yyo); } <uniqstr>
 %printer { fprintf (yyo, "[%s]", $$); } BRACKETED_ID
@@ -300,6 +305,7 @@ prologue_declaration:
       defines_flag = true;
       spec_defines_file = xstrdup ($2);
     }
+| "%error-verbose"                 { do_error_verbose (&@$, $1); }
 | "%expect" INT                    { expected_sr_conflicts = $2; }
 | "%expect-rr" INT                 { expected_rr_conflicts = $2; }
 | "%file-prefix" STRING            { spec_file_prefix = $2; }
@@ -853,6 +859,15 @@ add_param (param_type type, char *decl, location loc)
 }
 
 
+static void
+do_error_verbose (location const *loc, char const *directive)
+{
+  bison_directive (loc, directive);
+  muscle_percent_define_insert (directive, *loc, muscle_keyword, "",
+                                MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
+}
+
+
 static void
 do_name_prefix (location const *loc,
                 char const *directive, char const *value)

src/scan-gram.l

@@ -263,7 +263,7 @@ eqopt    ({sp}=)?
 
   /* Deprecated since Bison 3.0 (2013-07-25), but the warning is
      issued only since Bison 3.3. */
-  "%error-verbose"                  DEPRECATED ("%define parse.error verbose");
+  "%error-verbose"                  RETURN_VALUE (PERCENT_ERROR_VERBOSE, uniqstr_new (yytext));
 
   /* Deprecated since Bison 2.6 (2012-07-19), but the warning is
      issued only since Bison 3.3. */
@@ -271,7 +271,7 @@ eqopt    ({sp}=)?
 
   /* Deprecated since Bison 2.7.90, 2012. */
   "%default"[-_]"prec"              DEPRECATED ("%default-prec");
-  "%error"[-_]"verbose"             DEPRECATED ("%define parse.error verbose");
+  "%error"[-_]"verbose"             RETURN_VALUE (PERCENT_ERROR_VERBOSE, uniqstr_new (yytext));
   "%expect"[-_]"rr"                 DEPRECATED ("%expect-rr");
   "%file-prefix"{eqopt}             DEPRECATED ("%file-prefix");
   "%fixed"[-_]"output"[-_]"files"   DEPRECATED ("%fixed-output-files");

tests/input.at

@@ -2537,10 +2537,8 @@ input.y:25.1-12: warning: deprecated directive: '%pure_parser', use '%pure-parse
 fix-it:"input.y":{25:1-25:13}:"%pure-parser"
 input.y:26.1-12: warning: deprecated directive: '%token_table', use '%token-table' [-Wdeprecated]
 fix-it:"input.y":{26:1-26:13}:"%token-table"
-input.y:27.1-14: warning: deprecated directive: '%error-verbose', use '%define parse.error verbose' [-Wdeprecated]
-fix-it:"input.y":{27:1-27:15}:"%define parse.error verbose"
-input.y:27-14: error: %define variable 'parse.error' redefined
-input.y:11-14:     previous definition
+input.y:27.1-14: error: %define variable 'parse.error' redefined
+input.y:11.1-14:     previous definition
 input.y:29.1-18: warning: deprecated directive: '%name-prefix "bar"', use '%define api.prefix {bar}' [-Wdeprecated]
 fix-it:"input.y":{29:1-29:19}:"%define api.prefix {bar}"
 ]])
@@ -2587,7 +2585,7 @@ AT_CHECK([cat input.y], [],
 %output "foo"
 %pure-parser
 %token-table
-%define parse.error verbose
+%error-verbose
 %glr-parser
 %define api.prefix {bar}
 %%
@@ -2597,9 +2595,9 @@ exp : '0'
 # Unfortunately so far we don't remove duplicate definitions,
 # so there are still warnings.
 AT_BISON_CHECK([[-fcaret input.y]], [[1]], [],
-[[input.y:26.1-27: error: %define variable 'parse.error' redefined
- %define parse.error verbose
- ^~~~~~~~~~~~~~~~~~~~~~~~~~~
+[[input.y:26.1-14: error: %define variable 'parse.error' redefined
+ %error-verbose
+ ^~~~~~~~~~~~~~
 input.y:11.1-27:     previous definition
  %define parse.error verbose
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -2642,12 +2640,10 @@ AT_BISON_CHECK([[input.y]], [[1]], [[]],
 input.y:11.15-24: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
 input.y:12.15-24: warning: deprecated directive: '%expect_rr', use '%expect-rr' [-Wdeprecated]
 input.y:13.1-14: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
-input.y:13.16-29: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
-input.y:13.3-29: error: %define variable 'parse.error' redefined
-input.y:13-14:       previous definition
-input.y:14.16-29: warning: deprecated directive: '%error_verbose', use '%define parse.error verbose' [-Wdeprecated]
-input.y:14.3-29: error: %define variable 'parse.error' redefined
-input.y:13.3-29:     previous definition
+input.y:13.16-29: error: %define variable 'parse.error' redefined
+input.y:13.1-14:      previous definition
+input.y:14.16-29: error: %define variable 'parse.error' redefined
+input.y:13.16-29:     previous definition
 ]])
 
 AT_CLEANUP