result code = -1 standard error = { tests/diagnostics/setter-method.slang(16): error 30011: left of '=' is not an l-value. tests/diagnostics/setter-method.slang(16): note 30049: a 'this' parameter is currently immutable in Slang tests/diagnostics/setter-method.slang(21): error 30011: left of '=' is not an l-value. tests/diagnostics/setter-method.slang(21): note 30049: a 'this' parameter is currently immutable in Slang } standard output = { }