Parsing Expression Grammars, part 4 (Left-recursion considered harmful)

[Dale Schumacher]

Parsing Expression Grammars, part 4 (http://bit.ly/iVXPEJ) addresses
the issue of left-recursive grammars, often used for left-associative
arithmetic operators.  Accumulating a value via iteration is proposed
as an appropriate solution for recursive-descent parsers like PEGs.

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