parser bug?

[Charles Hixson via Digitalmars-d-learn]

The code:
     void    go    (ulong    recNum)
     {    assert (buf[0] == (fh.sizeof + recNo * buf.length) & 0x7f);
         if    (dirty)
yields the error message:
ells$ dmd test.d
test.d(78): Error: buf[0] == fh.sizeof + recNo * buf.length must be 
parenthesized when next to operator &

And I'll swear it looks parenthesized to me.

     void    go    (ulong    recNum)
     {    ubyte    tst    =    (fh.sizeof + recNo * buf.length) & 0x7f;
         assert (buf[0] == tst);
         if    (dirty)

compiles without error.

Any idea what's going on?