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Stub in addstruct(), and turn failed dups into errors.

--- a/opt/match.c

+++ b/opt/match.c

@@ -105,6 +105,11 @@

     return t;

 }

+static Dtree *addstruct(Dtree *t, Node *pat, Node ***cap, size_t *ncap)

+{

+    return NULL;

+}

+

 static Dtree *addpat(Dtree *t, Node *pat, Node ***cap, size_t *ncap)

 {

     Dtree *ret;

@@ -127,11 +132,13 @@

         case Oarr:

             ret = addarr(t, pat, cap, ncap);

             break;

+        case Ostruct:

+            ret = addstruct(t, pat, cap, ncap);

+            break;

         default:

-            /* Right now, we just use this code for warning.

-             *

-             * We shoudl fatal(unsupported match) here*/

-            return NULL;

+            ret = NULL;

+            fatal(pat, "unsupported pattern %s of type %s", opstr(exprop(pat)), tystr(exprtype(pat)));

+            break;

     }

     return ret;