Extra ALWAYS() macros to verify state in the sqlite3ExprCanBeNull() routine.

FossilOrigin-Name: be19b84c9f3fe127165809908add148dbe9a827a55608b0490de7e69b7f7f191

manifest

@@ -1,5 +1,5 @@
-C Remove\sa\sstray\scomment\sin\sthe\sJSON\scode.
-D 2023-12-19T00:07:38.941
+C Extra\sALWAYS()\smacros\sto\sverify\sstate\sin\sthe\ssqlite3ExprCanBeNull()\sroutine.
+D 2023-12-19T11:57:29.394
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-F src/expr.c 8f8ed8a5977a54c678755e43aabb3bbe29984025d086128a93e52675987c34eb
+F src/expr.c c21c6d1ba6e73b65ad7dd08336956c631b35a3c44935a8b4f26a766493642fa4
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@@ -2155,8 +2155,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-6618bdf0679405b43911ea8cd94050b12a5dc469f3dfe4759ee3ff850a55229e
+be19b84c9f3fe127165809908add148dbe9a827a55608b0490de7e69b7f7f191

src/expr.c

@@ -2743,6 +2743,8 @@ int sqlite3ExprCanBeNull(const Expr *p){
              p->y.pTab==0 ||  /* Reference to column of index on expression */
              (p->iColumn>=0
               && p->y.pTab->aCol!=0 /* Possible due to prior error */
+              && ALWAYS(p->iColumn>=0)
+              && ALWAYS(p->iColumn<p->y.pTab->nCol)
               && p->y.pTab->aCol[p->iColumn].notNull==0);
     default:
       return 1;