The exec statement is used to assign a value of an expression to a parameter. The statement is the default one, thus the exec keyword can be omitted. The expression can take a form of:

• literal value,
• parameter,
• Haskell expression (probably with some Haskell functions).

The exec statement is a single-step statement.

exec parameter = expression;
parameter = expression;

Listing 1. Exec statement syntax

x = 7;
exec x = 7;
x = x + 1;
x = sqrt x + 2;

Listing 2. Exec statement examples

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