Description
The groovy.transform.Immutable GroovyDoc shows some examples but some of them are for the Canonical transformation.
See for example line 139 of https://git-wip-us.apache.org/repos/asf?p=groovy.git;a=blob;f=src/main/groovy/groovy/transform/Immutable.groovy;h=4c130a366239d5b9df37765c8733d3c5eb316eed;hb=HEAD