fix implicit construction at ctfe

Author: adamdruppe

compiler/src/dmd/dcast.d

@@ -142,7 +142,8 @@ Expression implicitCastTo(Expression e, Scope* sc, Type t)
             if (ad) {
                 import dmd.identifier;
                 import dmd.id;
-                auto tmp = new VarDeclaration(e.loc, t, Identifier.generateId("__ictorcmp"), null);
+                auto tmp = new VarDeclaration(e.loc, t, Identifier.generateId("__ictorcmp"), new ExpInitializer(e.loc, e));
+                tmp.storage_class = STC.rvalue | STC.temp | STC.ctfe;
                 tmp.dsymbolSemantic(sc);
 
                 Expression decl = new DeclarationExp(e.loc, tmp);
@@ -153,11 +154,13 @@ Expression implicitCastTo(Expression e, Scope* sc, Type t)
                 auto ce = new CallExp(e.loc, e2, e);
                 e2 = ce;
 
-                auto declareTmps = new CommaExp(e.loc, decl, e2);
+                //auto declareTmps = new CommaExp(e.loc, decl, e2);
 
                 if (sc && .trySemantic(e2, sc)) {
                         if (hasImplicitAttr(ce.f)) {
-                            result = declareTmps.expressionSemantic(sc);
+                            //printf("implicit construction of %s @ %s\n", declareTmps.toChars(), e.loc.toChars());
+                            //printf("implicit construction of %s @ %s\n", decl.toChars(), e.loc.toChars());
+                            result = decl.expressionSemantic(sc);
                             // printf("implicit construction of %s @ %s\n", t.toChars(), e.loc.toChars());
                             return result;
                         }

compiler/src/dmd/dinterpret.d

@@ -5029,6 +5029,9 @@ public:
             if (vd is null)
                 return false;
 
+            if(vd._init is null)
+                return false;
+
             auto ei = vd._init.isExpInitializer();
             if (ei is null)
                 return false;
@@ -6142,7 +6145,7 @@ public:
                     return;
                 }
 
-		import dmd.utils : arrayCastBigEndian;
+                import dmd.utils : arrayCastBigEndian;
 
                 auto str = arrayCastBigEndian(se.peekData(), sz);
                 emplaceExp!(StringExp)(pue, e1.loc, str, se.len / sz, cast(ubyte) sz);