Remove out-of-date comment regarding use of Parse.pConstExpr.

FossilOrigin-Name: 71548f72ad578db3d6ee409956386ace23ab2258d37cdc29ef2fb126e48f1ee3

2 files changed, 5 insertions, 9 deletions

diff --git a/src/build.c b/src/build.c
index fe3a781d6..59e3e23f0 100644
--- a/src/build.c
+++ b/src/build.c
@@ -246,19 +246,14 @@ void sqlite3FinishCoding(Parse *pParse){
     */
     if( pParse->pAinc ) sqlite3AutoincrementBegin(pParse);
 
-    /* Code constant expressions that where factored out of inner loops.
-    **
-    ** The pConstExpr list might also contain expressions that we simply
-    ** want to keep around until the Parse object is deleted.  Such
-    ** expressions have iConstExprReg==0.  Do not generate code for
-    ** those expressions, of course.
+    /* Code constant expressions that were factored out of inner loops. 
     */
     if( pParse->pConstExpr ){
       ExprList *pEL = pParse->pConstExpr;
       pParse->okConstFactor = 0;
       for(i=0; i<pEL->nExpr; i++){
-        int iReg = pEL->a[i].u.iConstExprReg;
-        sqlite3ExprCode(pParse, pEL->a[i].pExpr, iReg);
+        assert( pEL->a[i].u.iConstExprReg>0 );
+        sqlite3ExprCode(pParse, pEL->a[i].pExpr, pEL->a[i].u.iConstExprReg);
       }
     }
 
diff --git a/src/expr.c b/src/expr.c
index d96f36285..9f876e610 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -5048,7 +5048,7 @@ expr_code_doover:
 ** once. If no functions are involved, then factor the code out and put it at
 ** the end of the prepared statement in the initialization section.
 **
-** If regDest>=0 then the result is always stored in that register and the
+** If regDest>0 then the result is always stored in that register and the
 ** result is not reusable.  If regDest<0 then this routine is free to
 ** store the value wherever it wants.  The register where the expression
 ** is stored is returned.  When regDest<0, two identical expressions might
@@ -5063,6 +5063,7 @@ int sqlite3ExprCodeRunJustOnce(
 ){
   ExprList *p;
   assert( ConstFactorOk(pParse) );
+  assert( regDest!=0 );
   p = pParse->pConstExpr;
   if( regDest<0 && p ){
     struct ExprList_item *pItem;