{} ←スクリプトブロック
&{} ←スクリプトブロックを作って即実行
基本的に外の変数に作用しない
$n = 10
&{$n++; echo $n}
# 11
&{$n++; echo $n}
# 11
$n
# 10
ただし、globalスコープ等を使うと外に作用してしまう
$n = 10
&{$global:n=5; echo $n}
# 5
$n
# 5
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