Index: src/alter.c
==================================================================
--- src/alter.c
+++ src/alter.c
@@ -811,11 +811,11 @@
     zType = "virtual table";
   }
 #endif
   if( zType ){
     sqlite3ErrorMsg(
-        pParse, "columns of %s %s may not be renamed", zType, pTab->zName
+        pParse, "cannot rename columns of %s \"%s\"", zType, pTab->zName
     );
     return 1;
   }
   return 0;
 }
@@ -1071,12 +1071,12 @@
   sqlite3_context *pCtx, 
   sqlite3_value *pType,
   sqlite3_value *pObject,
   Parse *pParse
 ){
-  const char *zT = sqlite3_value_text(pType);
-  const char *zN = sqlite3_value_text(pObject);
+  const char *zT = (const char*)sqlite3_value_text(pType);
+  const char *zN = (const char*)sqlite3_value_text(pObject);
   char *zErr;
 
   zErr = sqlite3_mprintf("error processing %s %s: %s", zT, zN, pParse->zErrMsg);
   sqlite3_result_error(pCtx, zErr, -1);
   sqlite3_free(zErr);

Index: test/altercol.test
==================================================================
--- test/altercol.test
+++ test/altercol.test
@@ -501,14 +501,14 @@
   CREATE VIEW v1 AS SELECT * FROM t1;
   CREATE VIEW v2(c, d) AS SELECT * FROM t1;
 }
 do_catchsql_test 12.2.2 {
   ALTER TABLE v1 RENAME a TO z;
-} {1 {columns of view v1 may not be renamed}}
+} {1 {cannot rename columns of view "v1"}}
 do_catchsql_test 12.2.3 {
   ALTER TABLE v2 RENAME c TO y;
-} {1 {columns of view v2 may not be renamed}}
+} {1 {cannot rename columns of view "v2"}}
 
 ifcapable fts5 {
   do_execsql_test 12.3.1 {
     CREATE VIRTUAL TABLE ft USING fts5(a, b, c);
   }
@@ -633,6 +633,5 @@
   FROM ddd;
 } {{} {} {}}
 
 
 finish_test
-