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@ -141,10 +141,13 @@ module Lox
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end
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def visit_call(expr)
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callee = evaluate(expr.callee)
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func = evaluate(expr.callee)
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args = expr.args.map { evaluate(_1) }
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callee.call(self, args)
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raise RuntimeError.new(expr.paren, "Can only call functions and classes.") unless func.respond_to?(:call)
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raise RuntimeError.new(expr.paren, "Expected #{func.arity} arguments but got #{args.size}.") unless args.size == func.arity
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func.call(self, args)
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end
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private
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