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    <p>The spec requires that both a setter and getter are defined to be able to use the syntactic sugar for calling the setter:</p> <blockquote> <p>The interpretation of an assignment to a simple variable x = e depends on the definition of x. If x denotes a mutable variable, then the assignment changes the current value of x to be the result of evaluating the expression e. The type of e is expected to conform to the type of x. <strong>If x is a parameterless function defined in some template, and the same template contains a setter function x_= as member, then the assignment x = e is interpreted as the invocation x_=(e ) of that setter function.</strong> Analogously, an assignment f .x = e to a parameterless function x is interpreted as the invocation f .x_=(e ). An assignment f (args) = e with a function application to the left of the ‘=’ operator is interpreted as f .update(args, e ), i.e. the invocation of an update function defined by f .</p> </blockquote> <p>Furthermore, the getter must be visible in order to use the setter. I'm not sure if this is specified</p> <h2>Getter not visible #1</h2> <pre><code>// error: method x cannot be accessed in x.Test object x { class Test { private[this] var x0: Int = 0 private[Test] def x = x0 def x_=(a: Int) = x0 = a } val t = new Test t.x = 1 } </code></pre> <h2>Getter not visible #2</h2> <pre><code>//&lt;console&gt;:11: error: type mismatch; found : x.Test required: ?{val x: ?} object x { class Test { private[this] var x0: Int = 0 private[this] def x = x0 def x_=(a: Int) = x0 = a } val t = new Test t.x = 1 } </code></pre> <h2>Getter visible</h2> <pre><code>object x { class Test { private[this] var x0: Int = 0 private[x] def x = x0 def x_=(a: Int) = x0 = a } val t = new Test t.x = 1 } </code></pre>
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    1. POScala: can't write setter without getter?
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    1. COThe "Getter Visible" example does not work in repl. <console>:14: error: type mismatch; found : x.type (with underlying type object x) required: ?{val x: ?}
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