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https://issues.apache.org/jira/browse/GROOVY-11137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18043663#comment-18043663
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Eric Milles commented on GROOVY-11137:
--------------------------------------
Another union type example that does not work properly:
{code:groovy}
switch (object) {
case Number:
case String:
object.somethingCommonToNumberAndString()
}
{code}
STC thinks the type of "object" is "(Number & String)" but it should be
"(Number | String)".
> Improve support for union and intersection types
> ------------------------------------------------
>
> Key: GROOVY-11137
> URL: https://issues.apache.org/jira/browse/GROOVY-11137
> Project: Groovy
> Issue Type: Improvement
> Components: parser-antlr4, Static Type Checker
> Reporter: Eric Milles
> Priority: Major
>
> Union types are partially supported:
> {code:groovy}
> try {
> foo()
> } catch (Exception | Error e) { // parses
> e.printStackTrace() // flow type of e is probably Throwable but should be
> (Exception | Error)
> }
> {code}
> But don't have direct representation or support in the AST.
> Intersection types (declared with {{&}}) are not supported:
> {code:groovy}
> // parses as method call: (a & b).call({ ... })
> var fun = (Function<String,String> & Serializable) { x -> x }
> void test(Number number) {
> if (number instanceof Comparable) {
> number // flow type is ? but should be (Number & Comparable)
> }
> }
> {code}
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