Hi--
Very strange. Could you confirm in the inspector that the underlying stream is really a binary stream with element type (UNSIGNED-BYTE 8)?
Here's the description of the underlying stream from the slime inspector -- I can't inspect this stream itself in slime...
#<FILE-BINARY-INPUT-STREAM ("home:src;site;flexi-streams-0.11.2;test;hebrew_utf8_lf.txt"/10) #x8557786> Class: #<STANDARD-CLASS CCL::FILE-BINARY-INPUT-STREAM> Wrapper: #<CCL::CLASS-WRAPPER CCL::FILE-BINARY-INPUT-STREAM #x810DDF6> Instance slots CCL::DIRECTION: :INPUT CCL::CLOSED: NIL CCL::SHARED-RESOURCE: NIL CCL::IOBLOCK: #S(CCL::FILE-IOBLOCK :STREAM #<FILE-BINARY-INPUT-STREAM ("home:src;site;flexi-streams-0.11.2;test;hebrew_utf8_lf.txt"/10) #x8557786> :UNTYI-CHAR NIL :INBUF #<IO-BUFFER (UNSIGNED-BYTE 8) 3/2048/2048 #x85576F6> :OUTBUF NIL :ELEMENT-TYPE (INTEGER 0 255) :ELEMENT-SHIFT 0 :CHARPOS 0 :DEVICE 10 :ADVANCE-FUNCTION CCL::INPUT-FILE-IOBLOCK-ADVANCE ..) CCL::ELEMENT-TYPE: (INTEGER 0 255) CCL::FILENAME: "home:src;site;flexi-streams-0.11.2;test;hebrew_utf8_lf.txt" CCL::ACTUAL-FILENAME: NIL CCL::EXTERNAL-FORMAT: :BINARY
And (using the debugger - I think, IIRC, you press v on the top frame) could you try to find the exact place where the error occurs?
the error is occurring in input.lisp, when stream-read-char is called from compare-files in test.lisp.
regards
Tiarnán