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Remove unused var
from calculator grammar.
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@ -124,7 +124,7 @@ parens m = do
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-- digit = "0" | "1" | ... | "8" | "9".
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-- expr = term { addop term }.
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-- term = factor { mulop factor }.
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-- factor = "(" expr ")" | var | number.
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-- factor = "(" expr ")" | number.
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-- addop = "+" | "-".
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-- mulop = "*".
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@ -153,7 +153,7 @@ number = [ "-" ] digit { digit }.
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digit = "0" | "1" | ... | "8" | "9".
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expr = term { addop term }.
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term = factor { mulop factor }.
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factor = "(" expr ")" | var | number.
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factor = "(" expr ")" | number.
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addop = "+" | "-".
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mulop = "*".
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```
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