FIX: throw an error when checksum is used with refines on a file ar…

…gument

src/core/n-strings.c

@@ -171,7 +171,7 @@ static struct digest {
 /*
 //	checksum: native [
 //		{Computes a checksum, CRC, hash, or HMAC.}
-//		data [binary! string! file!] {If string, it will be UTF8 encoded}
+//		data [binary! string! file!] {If string, it will be UTF8 encoded. File is dispatched to file-checksum function.}
 //		method [word!] {One of `system/catalog/checksums` and HASH}
 //		/with {Extra value for HMAC key or hash table size; not compatible with TCP/CRC24/CRC32/ADLER32 methods.}
 //		 spec [any-string! binary! integer!] {String or binary for MD5/SHA* HMAC key, integer for hash table size.}
@@ -208,6 +208,9 @@ static struct digest {
 		// Dispatch file to file-checksum function...
 		REBVAL *func = Find_Word_Value(Lib_Context, SYM_FILE_CHECKSUM);
 		if (func && IS_FUNCTION(func) && sym > SYM_CRC32 && sym <= SYM_RIPEMD160) {
+			if (D_REF(ARG_CHECKSUM_WITH) || D_REF(ARG_CHECKSUM_PART))
+				Trap0(RE_BAD_REFINES);
+
 			// Build block to evaluate: [file-checksum data method]
 			// Where method must be converted to lit-word first...
 			VAL_TYPE(method) = REB_LIT_WORD;

src/tests/units/checksum-test.r3

@@ -273,6 +273,10 @@ AF45D2E376484031617F78D2B58A6B1B9C7EF464F5A01B47E42EC3736322445E
 	--assert (checksum %units/files/pdf-maker-doc.pdf 'sha1)   == #{A598B252C045ABF94EE5F034798B384056C57086}
 	--assert (checksum %units/files/pdf-maker-doc.pdf 'sha256) == #{FA24645FE45C06DEB31DEC0B4478718A3ABE3F8C923A3B720B5564DAA2C9FC0F}
 
+	--test-- "checksum file! with refines"
+	;; refines are not supported
+	--assert all [error? e: try [checksum/part %units/files/pdf-maker-doc.pdf 'md5 1] e/id = 'bad-refines]
+	--assert all [error? e: try [checksum/with %units/files/pdf-maker-doc.pdf 'md5 1] e/id = 'bad-refines]
 ===end-group===