5 May
2002
5 May
'02
10:03 a.m.
Well, I figured it out myself in the end... it's gcc dodginess :/ numberToInt checks the number that's been read against minBound :: Int. In the 64-bit STG C code this ends up being: _Cak7_=(-9223372036854775808)<=(I_)(R1.p[1]); If I were to read the gcc warnings it would say: Text/Read/Lex.hc:40: warning: decimal constant is so large that it is unsigned and it seems to make a dodgy optimisation on that basis. If I change the constant to -(2^63-1) instead of -2^63 it works, and without the warning message. Which seems like a compiler bug to me, since -2^63 is a valid 64-bit signed number. I'll see what the gcc folks have to say. Matt