Revert "Fix #76813: Access violation near NULL on source operand"

This reverts commit 5e15c9c41f, since
re2c default rules are only available as of re2c 0.13.7.

NEWS

@@ -72,9 +72,6 @@ PHP                                                                        NEWS
   . Fixed bug #76815 (PDOStatement cannot be GCed/closeCursor-ed when a
     PROCEDURE resultset SIGNAL). (Nikita)
 
-- Phpdbg:
-  . Fixed bug #76813 (Access violation near NULL on source operand). (cmb)
-
 - Standard:
   . Fixed bug #77423 (FILTER_VALIDATE_URL accepts URLs with invalid userinfo). 
     (CVE-2020-7071) (cmb)

sapi/phpdbg/phpdbg_lexer.l

@@ -33,7 +33,7 @@ void phpdbg_init_lexer (phpdbg_param_t *stack, char *input) {
 
 	YYSETCONDITION(INITIAL);
 
-	LEX(text) = YYCURSOR = YYMARKER = (unsigned char *) input;
+	LEX(text) = YYCURSOR = (unsigned char *) input;
 	LEX(len) = strlen(input);
 }
 
@@ -165,10 +165,6 @@ INPUT       ("\\"[#"']|["]("\\\\"|"\\"["]|[^\n\000"])+["]|[']("\\"[']|"\\\\"|[^\
 	return T_ID;
 }
 
-<NORMAL>* {
-	return T_UNEXPECTED;
-}
-
 <RAW>{INPUT} {
 	phpdbg_init_param(yylval, STR_PARAM);
 	yylval->str = estrdup(yytext);

sapi/phpdbg/phpdbg_parser.y

@@ -63,13 +63,9 @@ typedef void* yyscan_t;
 %% /* Rules */
 
 input
-	: non_empty_input { $$ = $1; }
-	| /* empty */
-	;
-
-non_empty_input
 	: command { $$ = $1; }
-	| non_empty_input T_SEPARATOR command { phpdbg_stack_separate($1.top); $$ = $3; }
+	| input T_SEPARATOR command { phpdbg_stack_separate($1.top); $$ = $3; }
+	| /* empty */
 	;
 
 command

sapi/phpdbg/tests/bug76813.phpt

@@ -1,10 +0,0 @@
---TEST--
-Bug #76813 (Access_violation_near_NULL_on_source_operand)
---PHPDBG--
-"#!==)===\377\377\276\242="
-#!==)===\377\377\276\242=
---EXPECT--
-prompt> [Parse Error: syntax error, unexpected input, expecting $end]
-prompt> [Parse Error: syntax error, unexpected # (pound sign), expecting $end]
-prompt> [Parse Error: syntax error, unexpected # (pound sign), expecting $end]
-prompt>