fix equal? between an array and a non-array

OK let's try again. While the thanks go to Daniel Llorens del Río for
the tip, the blame continues going to me :)

* test-suite/Makefile.am:
* test-suite/tests/arrays.test: Add a test.

* libguile/array-map.c (raeql): Handle a few 0-dimensional cases. If the
  shapes of the arrays don't match, just return #f instead of raising
  an error.

libguile/array-map.c

@@ -863,20 +863,29 @@ raeql (SCM ra0, SCM as_equal, SCM ra1)
   scm_t_array_dim *s0 = &dim0, *s1 = &dim1;
   unsigned long bas0 = 0, bas1 = 0;
   int k, unroll = 1, vlen = 1, ndim = 1;
+
   if (SCM_I_ARRAYP (ra0))
     {
+      if (SCM_I_ARRAY_NDIM (ra0) == 0)
+        return scm_is_true (scm_equal_p (scm_array_ref (ra0, SCM_EOL), ra1));
       ndim = SCM_I_ARRAY_NDIM (ra0);
       s0 = SCM_I_ARRAY_DIMS (ra0);
       bas0 = SCM_I_ARRAY_BASE (ra0);
       v0 = SCM_I_ARRAY_V (ra0);
     }
-  else
+  else if (scm_is_generalized_vector (v0))
     {
       s0->inc = 1;
       s0->lbnd = 0;
       s0->ubnd = scm_c_generalized_vector_length (v0) - 1;
       unroll = 0;
     }
+  else if (SCM_I_ARRAYP (ra1) && SCM_I_ARRAY_NDIM (ra1) == 0)
+    return scm_is_true (scm_equal_p (ra0, scm_array_ref (ra1, SCM_EOL)));
+  else
+    /* It's just not working out, dear. */
+    return 0;
+
   if (SCM_I_ARRAYP (ra1))
     {
       if (ndim != SCM_I_ARRAY_NDIM (ra1))
@@ -885,18 +894,17 @@ raeql (SCM ra0, SCM as_equal, SCM ra1)
       bas1 = SCM_I_ARRAY_BASE (ra1);
       v1 = SCM_I_ARRAY_V (ra1);
     }
-  else
+  else if (scm_is_generalized_vector (v1))
     {
-      /*
-	Huh ? Schizophrenic return type. --hwn
-      */
-      if (1 != ndim)
-	return 0;
       s1->inc = 1;
       s1->lbnd = 0;
       s1->ubnd = scm_c_generalized_vector_length (v1) - 1;
       unroll = 0;
     }
+  else
+    /* It's not you, it's me. */
+    return 0;
+
   if (SCM_TYP7 (v0) != SCM_TYP7 (v1))
     return 0;
   for (k = ndim; k--;)

test-suite/Makefile.am

@@ -24,6 +24,7 @@ SUBDIRS = standalone
 SCM_TESTS = tests/alist.test			\
 	    tests/and-let-star.test		\
 	    tests/arbiters.test			\
+	    tests/arrays.test			\
 	    tests/asm-to-bytecode.test		\
 	    tests/bit-operations.test		\
 	    tests/brainfuck.test		\

test-suite/tests/arrays.test

@@ -0,0 +1,23 @@
+;;;; arrays.test --- tests guile's arrays     -*- scheme -*-
+;;;;
+;;;; Copyright 2010 Free Software Foundation, Inc.
+;;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+(define-module (test-suite test-unif)
+  #:use-module (test-suite lib))
+
+(pass-if "equal? on array and non-array"
+  (not (equal? #2f64((0 1) (2 3)) 100)))