On Dec 16, 2016, at 5:50 AM, Matt Wette <matt.wette@gmail.com> wrote:

OK.  This is gonna be hard to trace down.

I am on a Mac running Sierra, 10.12.2.  At work I am running 10.9 I believe, and I see the same behavior.

If I compile with gcc 6.2 or gcc4.9, but no extra flags besides —prefix, I get the following failure:

FAIL: numbers.test: string->number: valid complex number strings

and trace this down to 

meta/guile -c '(display (eqv? (imag-part (string->number "#i1@-0")) -0.0))' => #f