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Dump trait nodes for debugging.

--- a/parse/dump.c

+++ b/parse/dump.c

@@ -115,6 +115,7 @@

     size_t i;

     char *ty;

     int tid;

+    char buf[1024];

     indent(fd, depth);

     if (!n) {

@@ -227,7 +228,11 @@

             fprintf(fd, ")\n");

             break;

         case Nimpl:

-            die("Impl definition");

+            fprintf(fd, "(name = %s, type = %s)\n", namestr(n->impl.traitname), tyfmt(buf, sizeof buf, n->impl.type));

+            indent(fd, depth);

+            outnode(n->impl.traitname, fd, depth + 1);

+            for (i = 0; i < n->impl.ndecls; i++)

+                outnode(n->impl.decls[i], fd, depth+1);

             break;

         case Nnone:

             fprintf(stderr, "Nnone not a real node type!");