Merge pull request #3733 from 9rnsr/fix13024

[REG2.066a] Issue 13024 - [ICE](expression.c line 1172) with implicit supertype conversion of different enums in array literal

src/expression.c

@@ -1169,7 +1169,16 @@ bool arrayExpressionToCommonType(Scope *sc, Expressions *exps, Type **pt)
         {
             Expression *e = (*exps)[i];
             e = e->implicitCastTo(sc, t0);
-            assert(e->op != TOKerror);
+            //assert(e->op != TOKerror);
+            if (e->op == TOKerror)
+            {
+                /* Bugzilla 13024: a workaround for the bug in typeMerge -
+                 * it should paint e1 and e2 by deduced common type,
+                 * but doesn't in this particular case.
+                 */
+                t0 = Type::terror;
+                break;
+            }
             (*exps)[i] = e;
         }
     }

test/fail_compilation/ice13024.d

@@ -0,0 +1,16 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/ice13024.d(15): Error: cannot implicitly convert expression (t.x) of type A to B
+---
+*/
+
+enum A { a }
+enum B { b }
+struct T { A x; B y; }
+void main()
+{
+    T t;
+    auto r1 = [cast(int)(t.x), cast(int)(t.y)]; // OK
+    auto r3 = [t.x, t.y]; // crash
+}