There is a bug in Dec2001 Hugs (and earlier releases too) which causes
the Prelude function `interact' to behave unexpectedly - the user's
input is not echoed to the screen as she types it. A patch is attached
which solves the problem.
Regards,
Malcolm
--- src/iomonad.c Tue Dec 11 00:54:51 2001
+++ src/iomonad.c.patched Tue Dec 18 10:53:47 2001
@@ -844,6 +844,7 @@
HandleArg(h,1);
if (handles[h].hmode&HSEMICLOSED) { /* read requires semi-closed handle*/
Int c = (h==HSTDIN ? readTerminalChar() : getc(handles[h].hfp));
+ if (h==HSTDIN) putchar(c);
if (c!=EOF && c>=0 && c<NUM_CHARS) {
updapRoot(consChar(c),ap(nameHreader,primArg(1)));
return;
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