==================
const_negation
==================

program()
var
  x: const Int := -5
  y: const Int := -x

begin
  assert(x = -5);
  assert(y = 5);
end.

---

(source_file
  (program_declaration
    (var_section
      (variable_declaration
        (identifier_definition
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        (const_type
          (identifier))
        (unary_expression
          (literal
            (integer))))
      (variable_declaration
        (identifier_definition
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        (const_type
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        (unary_expression
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    (call_expression
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      (argument_list
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            (literal
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    (call_expression
      (identifier)
      (argument_list
        (binary_expression
          (identifier)
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