parser: remove `last`

vlib/compiler/parser.v

@@ -3393,17 +3393,6 @@ fn (p mut Parser) for_st() {
 		else if is_arr {
 			typ = typ[6..]// all after `array_`
 			p.gen_for_header(i, tmp, typ, val)
-			p.register_var(Var {
-				name: 'last'
-				typ: 'bool'
-				is_mut: false
-				is_used: true
-			})
-			// TODO don't generate if it's not used.
-			// Otherwise it's a C warning + perf.
-			if !p.is_js {
-				p.genln('bool last = $i == $tmp . len - 1;')
-			}
 		}
 		else if is_str {
 			typ = 'byte'