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Pretty printer generates least-parentheses output
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<?php
echo 'abc' . 'cde' . 'fgh';
echo 'abc' . ('cde' . 'fgh');
echo 'abc' . 1 + 2 . 'fgh';
echo 'abc' . (1 + 2) . 'fgh';
echo 1 * 2 + 3 / 4 % 5 . 6;
echo 1 * (2 + 3) / (4 % (5 . 6));
$a = $b = $c = $d = $f && true;
($a = $b = $c = $d = $f) && true;
$a = $b = $c = $d = $f and true;
$a = $b = $c = $d = ($f and true);
$a ? $b : $c ? $d : $e ? $f : $g;
$a ? $b : ($c ? $d : ($e ? $f : $g));
$a ? $b ? $c : $d : $f;
$a ?? $b ?? $c;
($a ?? $b) ?? $c;
$a ?? ($b ? $c : $d);
$a || ($b ?? $c);
(1 > 0) > (1 < 0);
++$a + $b;
$a + $b++;
$a ** $b ** $c;
($a ** $b) ** $c;
-1 ** 2;
yield from $a and yield from $b;
yield from ($a and yield from $b);
print ($a and print $b);
// The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment
// and incdec only work on variables.
!$a = $b;
++$a ** $b;
$a ** $b++;
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echo 'abc' . 'cde' . 'fgh';
echo 'abc' . ('cde' . 'fgh');
echo 'abc' . 1 + 2 . 'fgh';
echo 'abc' . (1 + 2) . 'fgh';
echo 1 * 2 + 3 / 4 % 5 . 6;
echo 1 * (2 + 3) / (4 % (5 . 6));
$a = $b = $c = $d = $f && true;
($a = $b = $c = $d = $f) && true;
$a = $b = $c = $d = $f and true;
$a = $b = $c = $d = ($f and true);
$a ? $b : $c ? $d : $e ? $f : $g;
$a ? $b : ($c ? $d : ($e ? $f : $g));
$a ? $b ? $c : $d : $f;
$a ?? $b ?? $c;
($a ?? $b) ?? $c;
$a ?? ($b ? $c : $d);
$a || ($b ?? $c);
(1 > 0) > (1 < 0);
++$a + $b;
$a + $b++;
$a ** $b ** $c;
($a ** $b) ** $c;
-1 ** 2;
yield from $a and yield from $b;
yield from ($a and yield from $b);
print ($a and print $b);
// The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment
// and incdec only work on variables.
!($a = $b);
(++$a) ** $b;
$a ** ($b++);