checker, cgen: use 'stmts.last()' instead of 'stmts[stmts.len - 1]' (#14105)

vlib/v/checker/checker.v

@@ -3497,7 +3497,7 @@ pub fn (mut c Checker) lock_expr(mut node ast.LockExpr) ast.Type {
 	// handle `x := rlock a { a.getval() }`
 	mut ret_type := ast.void_type
 	if node.stmts.len > 0 {
-		last_stmt := node.stmts[node.stmts.len - 1]
+		last_stmt := node.stmts.last()
 		if last_stmt is ast.ExprStmt {
 			ret_type = last_stmt.typ
 		}

vlib/v/checker/fn.v

@@ -302,7 +302,7 @@ fn (mut c Checker) fn_decl(mut node ast.FnDecl) {
 	// c.table.cur_fn = node
 	// Add return if `fn(...) ? {...}` have no return at end
 	if node.return_type != ast.void_type && node.return_type.has_flag(.optional)
-		&& (node.stmts.len == 0 || node.stmts[node.stmts.len - 1] !is ast.Return) {
+		&& (node.stmts.len == 0 || node.stmts.last() !is ast.Return) {
 		sym := c.table.sym(node.return_type)
 		if sym.kind == .void {
 			node.stmts << ast.Return{

vlib/v/checker/if.v

@@ -11,8 +11,8 @@ pub fn (mut c Checker) if_expr(mut node ast.IfExpr) ast.Type {
 	mut node_is_expr := false
 	if node.branches.len > 0 && node.has_else {
 		stmts := node.branches[0].stmts
-		if stmts.len > 0 && stmts[stmts.len - 1] is ast.ExprStmt
+		if stmts.len > 0 && stmts.last() is ast.ExprStmt
-			&& (stmts[stmts.len - 1] as ast.ExprStmt).typ != ast.void_type {
+			&& (stmts.last() as ast.ExprStmt).typ != ast.void_type {
 			node_is_expr = true
 		}
 	}

vlib/v/gen/c/cgen.v

@@ -4943,8 +4943,8 @@ fn (mut g Gen) or_block(var_name string, or_block ast.OrExpr, return_type ast.Ty
 			g.inside_or_block = false
 		}
 		stmts := or_block.stmts
-		if stmts.len > 0 && stmts[or_block.stmts.len - 1] is ast.ExprStmt
+		if stmts.len > 0 && stmts.last() is ast.ExprStmt
-			&& (stmts[stmts.len - 1] as ast.ExprStmt).typ != ast.void_type {
+			&& (stmts.last() as ast.ExprStmt).typ != ast.void_type {
 			g.indent++
 			for i, stmt in stmts {
 				if i == stmts.len - 1 {
@@ -4966,7 +4966,7 @@ fn (mut g Gen) or_block(var_name string, or_block ast.OrExpr, return_type ast.Ty
 			g.indent--
 		} else {
 			g.stmts(stmts)
-			if stmts.len > 0 && stmts[or_block.stmts.len - 1] is ast.ExprStmt {
+			if stmts.len > 0 && stmts.last() is ast.ExprStmt {
 				g.writeln(';')
 			}
 		}