update tests with assert, range func and style

Author: mrj0

examples/generics/main.go

@@ -15,15 +15,17 @@ import (
 // docker run --name sqlxpg -p 5444:5432 -e POSTGRES_PASSWORD=password -d docker.io/postgres:17.4
 
 const schema = `
-	CREATE TABLE IF NOT EXISTS person (
+	DROP TABLE IF EXISTS person;
+	CREATE TABLE person (
 	    id SERIAL PRIMARY KEY,
 		first_name text,
 		last_name text,
 		email text
 	);
 	TRUNCATE TABLE person;
 	
-	CREATE TABLE IF NOT EXISTS place (
+	DROP TABLE IF EXISTS place;
+	CREATE TABLE place (
 		country text,
 		city text NULL,
 		telcode integer

sqlx.go

@@ -1246,7 +1246,6 @@ func fieldsByTraversal(v reflect.Value, traversals [][]int, values []interface{}
 			// reflectx.FieldByIndexes initializes pointer fields, including pointers to nested structs.
 			// Use optDest to delay it until the first non-NULL value is scanned into a field of a nested struct.
 			// That way we can support LEFT JOINs with optional nested structs.
-			traversal := traversal
 			values[i] = optDest(func() interface{} {
 				return reflectx.FieldByIndexes(v, traversal).Addr().Interface()
 			})