result code = -1
standard error = {
tests/diagnostics/setter-method.slang(16): error 30011: left of '=' is not an l-value.
        center = value;
               ^
tests/diagnostics/setter-method.slang(16): note 30049: a 'this' parameter is an immutable parameter by default in Slang; apply the `[mutating]` attribute to the function declaration to opt in to a mutable `this`
tests/diagnostics/setter-method.slang(21): error 30011: left of '=' is not an l-value.
        this.radius = value;
                    ^
tests/diagnostics/setter-method.slang(21): note 30049: a 'this' parameter is an immutable parameter by default in Slang; apply the `[mutating]` attribute to the function declaration to opt in to a mutable `this`
}
standard output = {
}