* data/m4sugar/m4sugar.m4 (m4_map): Recognize when the list of

arguments is really empty, not only equal to `[]'.
* src/symtab.h, src/symtab.c (symbol_t): `destructor' is a new
member.
(symbol_destructor_set): New.
* src/output.c (symbol_destructors_output): New.
* src/reader.h (brace_code_t, current_braced_code): New.
* src/scan-gram.l (BRACED_CODE): Use it to branch on...
(handle_dollar): Rename as...
(handle_action_dollar): this.
(handle_destructor_dollar): New.
* src/parse-gram.y (PERCENT_DESTRUCTOR): New.
(grammar_declaration): Use it.
* data/bison.simple (yystos): Is always defined.
(yydestructor): New.
* tests/actions.at (Destructors): New.
* tests/calc.at (_AT_CHECK_CALC_ERROR): Don't rely on egrep.

src/parse-gram.h

@@ -14,37 +14,38 @@
      PERCENT_TOKEN = 261,
      PERCENT_NTERM = 262,
      PERCENT_TYPE = 263,
-     PERCENT_UNION = 264,
-     PERCENT_LEFT = 265,
-     PERCENT_RIGHT = 266,
-     PERCENT_NONASSOC = 267,
-     PERCENT_EXPECT = 268,
-     PERCENT_START = 269,
-     PERCENT_PREC = 270,
-     PERCENT_VERBOSE = 271,
-     PERCENT_ERROR_VERBOSE = 272,
-     PERCENT_OUTPUT = 273,
-     PERCENT_FILE_PREFIX = 274,
-     PERCENT_NAME_PREFIX = 275,
-     PERCENT_DEFINE = 276,
-     PERCENT_PURE_PARSER = 277,
-     PERCENT_DEFINES = 278,
-     PERCENT_YACC = 279,
-     PERCENT_DEBUG = 280,
-     PERCENT_LOCATIONS = 281,
-     PERCENT_NO_LINES = 282,
-     PERCENT_SKELETON = 283,
-     PERCENT_TOKEN_TABLE = 284,
-     TYPE = 285,
-     EQUAL = 286,
-     SEMICOLON = 287,
-     COLON = 288,
-     PIPE = 289,
-     ID = 290,
-     PERCENT_PERCENT = 291,
-     PROLOGUE = 292,
-     EPILOGUE = 293,
-     BRACED_CODE = 294
+     PERCENT_DESTRUCTOR = 264,
+     PERCENT_UNION = 265,
+     PERCENT_LEFT = 266,
+     PERCENT_RIGHT = 267,
+     PERCENT_NONASSOC = 268,
+     PERCENT_EXPECT = 269,
+     PERCENT_START = 270,
+     PERCENT_PREC = 271,
+     PERCENT_VERBOSE = 272,
+     PERCENT_ERROR_VERBOSE = 273,
+     PERCENT_OUTPUT = 274,
+     PERCENT_FILE_PREFIX = 275,
+     PERCENT_NAME_PREFIX = 276,
+     PERCENT_DEFINE = 277,
+     PERCENT_PURE_PARSER = 278,
+     PERCENT_DEFINES = 279,
+     PERCENT_YACC = 280,
+     PERCENT_DEBUG = 281,
+     PERCENT_LOCATIONS = 282,
+     PERCENT_NO_LINES = 283,
+     PERCENT_SKELETON = 284,
+     PERCENT_TOKEN_TABLE = 285,
+     TYPE = 286,
+     EQUAL = 287,
+     SEMICOLON = 288,
+     COLON = 289,
+     PIPE = 290,
+     ID = 291,
+     PERCENT_PERCENT = 292,
+     PROLOGUE = 293,
+     EPILOGUE = 294,
+     BRACED_CODE = 295
    };
 # endif
   /* POSIX requires `int' for tokens in interfaces.  */
@@ -57,43 +58,44 @@
 #define PERCENT_TOKEN 261
 #define PERCENT_NTERM 262
 #define PERCENT_TYPE 263
-#define PERCENT_UNION 264
-#define PERCENT_LEFT 265
-#define PERCENT_RIGHT 266
-#define PERCENT_NONASSOC 267
-#define PERCENT_EXPECT 268
-#define PERCENT_START 269
-#define PERCENT_PREC 270
-#define PERCENT_VERBOSE 271
-#define PERCENT_ERROR_VERBOSE 272
-#define PERCENT_OUTPUT 273
-#define PERCENT_FILE_PREFIX 274
-#define PERCENT_NAME_PREFIX 275
-#define PERCENT_DEFINE 276
-#define PERCENT_PURE_PARSER 277
-#define PERCENT_DEFINES 278
-#define PERCENT_YACC 279
-#define PERCENT_DEBUG 280
-#define PERCENT_LOCATIONS 281
-#define PERCENT_NO_LINES 282
-#define PERCENT_SKELETON 283
-#define PERCENT_TOKEN_TABLE 284
-#define TYPE 285
-#define EQUAL 286
-#define SEMICOLON 287
-#define COLON 288
-#define PIPE 289
-#define ID 290
-#define PERCENT_PERCENT 291
-#define PROLOGUE 292
-#define EPILOGUE 293
-#define BRACED_CODE 294
+#define PERCENT_DESTRUCTOR 264
+#define PERCENT_UNION 265
+#define PERCENT_LEFT 266
+#define PERCENT_RIGHT 267
+#define PERCENT_NONASSOC 268
+#define PERCENT_EXPECT 269
+#define PERCENT_START 270
+#define PERCENT_PREC 271
+#define PERCENT_VERBOSE 272
+#define PERCENT_ERROR_VERBOSE 273
+#define PERCENT_OUTPUT 274
+#define PERCENT_FILE_PREFIX 275
+#define PERCENT_NAME_PREFIX 276
+#define PERCENT_DEFINE 277
+#define PERCENT_PURE_PARSER 278
+#define PERCENT_DEFINES 279
+#define PERCENT_YACC 280
+#define PERCENT_DEBUG 281
+#define PERCENT_LOCATIONS 282
+#define PERCENT_NO_LINES 283
+#define PERCENT_SKELETON 284
+#define PERCENT_TOKEN_TABLE 285
+#define TYPE 286
+#define EQUAL 287
+#define SEMICOLON 288
+#define COLON 289
+#define PIPE 290
+#define ID 291
+#define PERCENT_PERCENT 292
+#define PROLOGUE 293
+#define EPILOGUE 294
+#define BRACED_CODE 295
 
 
 
 
 #ifndef YYSTYPE
-#line 90 "parse-gram.y"
+#line 91 "parse-gram.y"
 typedef union {
   symbol_t *symbol;
   symbol_list_t *list;
@@ -102,7 +104,7 @@ typedef union {
   associativity assoc;
 } yystype;
 /* Line 1271 of /usr/local/share/bison/bison.simple.  */
-#line 106 "y.tab.h"
+#line 108 "y.tab.h"
 # define YYSTYPE yystype
 #endif