Merge pull request #598 from makaimann/msat-signature-fix

Fix mathsat signature for BV_CONCAT

pysmt/solvers/msat.py

@@ -464,7 +464,7 @@ def __init__(self, environment, msat_env):
             mathsat.MSAT_TAG_BV_ADD: self._sig_binary,
             mathsat.MSAT_TAG_BV_UDIV:self._sig_binary,
             mathsat.MSAT_TAG_BV_UREM:self._sig_binary,
-            mathsat.MSAT_TAG_BV_CONCAT: self._sig_binary,
+            mathsat.MSAT_TAG_BV_CONCAT: self._sig_bv_concat,
             mathsat.MSAT_TAG_BV_OR:  self._sig_binary,
             mathsat.MSAT_TAG_BV_XOR: self._sig_binary,
             mathsat.MSAT_TAG_BV_AND: self._sig_binary,
@@ -565,6 +565,11 @@ def _sig_bv_extract(self, term, args):
         t = self.env.stc.get_type(args[0])
         return types.FunctionType(types.BVType(msb - lsb + 1), [t])
 
+    def _sig_bv_concat(self, term, args):
+        t1 = self.env.stc.get_type(args[0])
+        t2 = self.env.stc.get_type(args[1])
+        return types.FunctionType(types.BVType(t1.width + t2.width), [t1, t2])
+
     def _sig_array_read(self, term, args):
         t1 = self.env.stc.get_type(args[0])
         t = t1.elem_type