New installcheck failure, and "eval is now compile"

[Neil Jerram]

LD_LIBRARY_PATH="/home/neil/SW/Guile/ovnight/guile-master-20090822/_inst/lib:$LD_LIBRARY_PATH"
          \
          LTDL_LIBRARY_PATH=".:$LTDL_LIBRARY_PATH"      \
          
GUILE_LOAD_PATH="/home/neil/SW/Guile/ovnight/guile-master-20090822/_build/..:$GUILE_LOAD_PATH"
        \
          
PATH="/home/neil/SW/Guile/ovnight/guile-master-20090822/_inst/bin:$PATH"        
                      \
          GUILE_AUTO_COMPILE=0                                  \
          srcdir="../../examples"                                       \
          ../../examples/check.test
--- -   2009-08-22 06:10:14.764492993 +0100
+++ TMP 2009-08-22 06:10:14.000000000 +0100
@@ -1 +1 @@
-** Exception: (unbound-variable #f "Unbound variable: ~S" (open-input-file) #f)
+** Exception: (misc-error "module-lookup" "unbound variable: ~S" 
(open-input-file) #f)
make[2]: *** [installcheck] Error 1

In other words, the detail of the "unbound variable" exception has
changed.  I'm pretty sure this is a consequence of the "eval is now
compile" commit, and could be fixed by using primitive-eval instead of
eval in example/safe/safe; or by changing the VM code to use
error_unbound_variable instead of scm_misc_error.  But I don't
understand the "eval is now compile" commit yet; Andy, could you
explain the thinking here?

Thanks,
        Neil