Description:
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Using the increment or decrement operators immediately following respectively a plus or minus with a non-variable expression produces a parse error.

Reproduce code:
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($a+++$b) // works
(1+$a++)  // works
(1-++$a)  // works
($a+++1)  // works
(1+++$a)  // parse error

($a---$b) // works
(1-$a--)  // works
(1+--$a)  // works
($a---1)  // works
(1---$a)  // parse error