Thanks, bugs now fixed. The more serious one caused me to learn the hard way about an invariant that must hold for the names/tycons info the interpreter maintains on a per-module basis. The Dec 2001 release is not affected by this. --sigbjorn ----- Original Message ----- From: "Levent Erkok" <erkok@cse.ogi.edu> To: <hugs-bugs@haskell.org> Sent: Sunday, January 06, 2002 15:52 Subject: strange behavior of ":i"
Hugs version: Out of the CVS repository.
Load this file: (the syntax error is intentional.) ---------------------------------------------------- import IO
x= ----------------------------------------------------
After Hugs complains that there's an error (rightly so), type this:
---------------------------------------------------- IO> :i IORef ----------------------------------------------------
Hugs goes into an infinite loop.
I've looked at the code a bit. It dies down in the call to findName, on line 1810 of hugs.c. This call never returns.
Also, two if statements on lines 1797 and 1798 of hugs.c look suspicious:
if (!mod) { free(mod); mod = NULL; } if (!nm) { free(nm); nm = NULL; }
Looks like the tests are inverted. (The above bug is not caused by this, even when I remove the !'s, it still goes into an infinite loop.)
I've tried compiling after setting WANT_FIXED_SIZE_TABLES to 1 in prelude.h, but still the same.
What's strange is that I can't repeat the bug using any other import (i.e. anything other than IO), or without causing a syntax error in the file. Really weird.
-Levent.