Index: src/vdbemem.c
==================================================================
--- src/vdbemem.c
+++ src/vdbemem.c
@@ -407,11 +407,10 @@
   }else if( flags & MEM_Real ){
     return doubleToInt64(pMem->r);
   }else if( flags & (MEM_Str|MEM_Blob) ){
     i64 value = 0;
     assert( pMem->z || pMem->n==0 );
-    testcase( pMem->z==0 );
     sqlite3Atoi64(pMem->z, &value, pMem->n, pMem->enc);
     return value;
   }else{
     return 0;
   }
@@ -1064,11 +1063,12 @@
   if( NEVER(op==TK_REGISTER) ) op = pExpr->op2;
 
   if( op==TK_CAST ){
     u8 aff = sqlite3AffinityType(pExpr->u.zToken,0);
     rc = valueFromExpr(db, pExpr->pLeft, enc, aff, ppVal, pCtx);
-    if( rc==SQLITE_OK && *ppVal ){
+    testcase( rc!=SQLITE_OK );
+    if( *ppVal ){
       sqlite3VdbeMemCast(*ppVal, aff, SQLITE_UTF8);
       sqlite3ValueApplyAffinity(*ppVal, affinity, SQLITE_UTF8);
     }
     return rc;
   }