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`strrstr` can take and return `char const *`

--- a/src/asm/parser.y

+++ b/src/asm/parser.y

@@ -72,7 +72,7 @@

 	return r;

 }

-static char *strrstr(char *s1, char *s2)

+static char const *strrstr(char const *s1, char const *s2)

 {

 	size_t len1 = strlen(s1);

 	size_t len2 = strlen(s2);

@@ -80,7 +80,7 @@

 	if (len2 > len1)

 		return NULL;

-	for (char *p = s1 + len1 - len2; p >= s1; p--)

+	for (char const *p = s1 + len1 - len2; p >= s1; p--)

 		if (!strncmp(p, s2, len2))

 			return p;

@@ -1533,12 +1533,12 @@

 			rpn_Number(&$$, strcmp($3, $5));

 		}

 		| T_OP_STRIN T_LPAREN string T_COMMA string T_RPAREN {

-			char *p = strstr($3, $5);

+			char const *p = strstr($3, $5);

 			rpn_Number(&$$, p ? p - $3 + 1 : 0);

 		}

 		| T_OP_STRRIN T_LPAREN string T_COMMA string T_RPAREN {

-			char *p = strrstr($3, $5);

+			char const *p = strrstr($3, $5);

 			rpn_Number(&$$, p ? p - $3 + 1 : 0);

 		}