Use values in bindings instead of hardcoding numbers in test

[yousefmoazzam]

The following test defines some bindings with values in the test expression at the start, but then hardcodes the same values in the expected_ast_node binding value:

c-compiler/src/parse/c.rs

Lines 472 to 491 in 3e75565

	fn parse_expression_with_two_different_precedence_binary_operators() {
	let outer_left_operand = 1;
	let inner_left_operand = 2;
	let inner_right_operand = 3;
	let mut tokens = VecDeque::from([
	Token::NumericConstant(outer_left_operand),
	Token::Plus,
	Token::NumericConstant(inner_left_operand),
	Token::Asterisk,
	Token::NumericConstant(inner_right_operand),
	]);
	let expected_ast_node = Expression::Binary {
	op: BinaryOperator::Add,
	left: Box::new(Expression::NumericConstant(outer_left_operand)),
	right: Box::new(Expression::Binary {
	op: BinaryOperator::Multiply,
	left: Box::new(Expression::NumericConstant(2)),
	right: Box::new(Expression::NumericConstant(3)),
	}),
	};

It's best to reuse the bindings and get rid of the hardcoded/magic numbers, to avoid any errors with the hardcoded values going out of sync with the binding values.