merged APD bug 122 patch (sbcl-devel 2002-08-30)
Tweak seq.impure.lisp test more or less along the lines of
APD's explanation of the pathname problem. (SUBSEQ is
FLUSHABLE, and validly so. The old test bogusly relied
on it not being flushed and/or the compiler not being
infernally clever about type inference.)