Fix CPROVER counterexample translation

In some versions of CBMC, the full array is printed to
the counterexample every time an assignment to the  array
is performed. We use the line number information to detect
this and avoid printing the whole thing.

cex.py

@@ -81,7 +81,7 @@ def fmt(match, store_name, tid):
         s[1] for s in states
         if s[0]["function"] == "init" and not(LTSTAMP.match(s[1][0])))
     others = [
-        (s[0]["function"], *s[1]) for s in states
+        (s[0]["function"], s[0]["line"], *s[1]) for s in states
         if s[0]["function"] not in ("init", "__CPROVER_initialize")]
     yield "<initialization>"
     for i in inits:
@@ -92,7 +92,8 @@ def fmt(match, store_name, tid):
 
     agent = ""
     system = None
-    for i, (func, var, value) in enumerate(others):
+    last_line = None
+    for i, (func, line, var, value) in enumerate(others):
         if var == "__LABS_step":
             if system:
                 yield f"\n<end {system}>"
@@ -102,12 +103,11 @@ def fmt(match, store_name, tid):
             yield f"\n<{pprint_agent(info, agent)}: {func} '{info.lstig[int(value)].name}'>"  # noqa: E501
         elif var in ("firstAgent", "guessedcomp"):
             agent = value
-        else:
-            if (len(others) > i + 1 and LSTIG.match(var) and
-                    LTSTAMP.match(others[i + 1][0])):
-                pprint = pprint_assign(var, value, agent, endline=" ")
-            else:
-                pprint = pprint_assign(var, value, agent)
+        # If multiple assignments correspond to the same line, it's because
+        # we assigned to an array and CBMC is printing out the whole thing
+        elif last_line != line:
+            pprint = pprint_assign(var, value, agent)
+            last_line = line
             if pprint:
                 yield pprint