shithub: mc

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Don't die if we call fold() on NULL.

    Making it safe to call fold(NULL) is easier than adding
    checks wrapping all call sites.

--- a/opt/fold.c

+++ b/opt/fold.c

@@ -50,6 +50,8 @@

     vlong a, b;

     size_t i;

+    if (!n)

+        return NULL;

     assert(n->type == Nexpr);

     r = NULL;

     args = n->expr.args;

@@ -111,6 +113,12 @@

         case Oneg:

             if (islit(args[0], &a))

                 r = val(n->line, -a);

+            break;

+        case Ocast:

+            /* FIXME: we currentl assume that the bits of the

+             * val are close enough. */

+            r = args[0];

+            r->expr.type = exprtype(n);

             break;

         default:

             break;