File: Let1.session

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> Let1>> expr (lexer "1 + 2 - 3 * 4 / 5") :: [Expr]
> [Bin (Const 1) Plus (Bin (Const 2) Minus (Bin (Const 3) Times (Bin (Const 4) Divide (Const 5)))),Bin (Const 1) Plus (Bin (Const 2) Minus (Bin (Bin (Const 3) Times (Const 4)) Divide (Const 5))),Bin (Const 1) Plus (Bin (Bin (Const 2) Minus (Bin (Const 3) Times (Const 4))) Divide (Const 5)),Bin (Bin (Const 1) Plus (Bin (Const 2) Minus (Bin (Const 3) Times (Const 4)))) Divide (Const 5),Bin (Const 1) Plus (Bin (Bin (Const 2) Minus (Const 3)) Times (Bin (Const 4) Divide (Const 5))),Bin (Const 1) Plus (Bin (Bin (Bin (Const 2) Minus (Const 3)) Times (Const 4)) Divide (Const 5)),Bin (Bin (Const 1) Plus (Bin (Bin (Const 2) Minus (Const 3)) Times (Const 4))) Divide (Const 5),Bin (Bin (Const 1) Plus (Bin (Const 2) Minus (Const 3))) Times (Bin (Const 4) Divide (Const 5)),Bin (Bin (Bin (Const 1) Plus (Bin (Const 2) Minus (Const 3))) Times (Const 4)) Divide (Const 5),Bin (Bin (Const 1) Plus (Const 2)) Minus (Bin (Const 3) Times (Bin (Const 4) Divide (Const 5))),Bin (Bin (Const 1) Plus (Const 2)) Minus (Bin (Bin (Const 3) Times (Const 4)) Divide (Const 5)),Bin (Bin (Bin (Const 1) Plus (Const 2)) Minus (Bin (Const 3) Times (Const 4))) Divide (Const 5),Bin (Bin (Bin (Const 1) Plus (Const 2)) Minus (Const 3)) Times (Bin (Const 4) Divide (Const 5)),Bin (Bin (Bin (Bin (Const 1) Plus (Const 2)) Minus (Const 3)) Times (Const 4)) Divide (Const 5)]
> Let1>> expr (lexer "1 + - 3 * 4 / 5") :: [Expr]
> []
> Let1>> expr (lexer "1 + 2 - 3 * 4 / 5") :: Maybe Expr
> Just (Bin (Const 1) Plus (Bin (Const 2) Minus (Bin (Const 3) Times (Bin (Const 4) Divide (Const 5)))))