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foo() if $x;
bar() unless $x;

{                  | for my $b ( $x )   | for $x -> my $b
  my $b = $x;      | {                  | {
  foo() if $b;     |   foo() if $b;     |   foo() if $b;
  bar() unless $b; |   bar() unless $b; |   bar() unless $b;
}                  | }                  | }

foo() else bar() if $x;