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jakzale reports: 21:47:27 < int-e> Oh, nice. Yes, indeed pprHexVal (2^32^) W32 (function from cmm/PprC.hs) would result in 0xU. 21:50:29 < jakzale> int-e: yes, truncInt takes module 2^32^, then go returns empty string (I guess)

Here comes the test:

$ cat a.cmm

foo() {
    bits64 a;
    a = 0x10000000000000000; // overflows 64 bits
    return (a);
}

$ inplace/bin/ghc-stage2 -c a.cmm
/tmp/ghc8580_0/ghc_2.hc: In function 'foo':

/tmp/ghc8580_0/ghc_2.hc:8:7: error:
     error: invalid suffix "xUL" on integer constant
     _c0 = 0xUL;
           ^

I've broke it with commit:43f1b2ec when introduced truncation that can generate more zeroes.