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https://issues.apache.org/jira/browse/GROOVY-10888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher Smith updated GROOVY-10888:
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Affects Version/s: 4.0.12
> Parser doesn't accept wildcard in type witness
> ----------------------------------------------
>
> Key: GROOVY-10888
> URL: https://issues.apache.org/jira/browse/GROOVY-10888
> Project: Groovy
> Issue Type: Bug
> Components: parser-antlr4
> Affects Versions: 4.0.7, 4.0.12
> Reporter: Christopher Smith
> Priority: Major
>
> In trying to work around issues relating to nested generic inference (in
> stream collector definitions), I attempted to add a type witness to a
> {{.collect}} invocation. As I don't care about the accumulator, and the
> built-in {{Collectors}} tend to use {{A=?}}, I tried a wildcard, but I got a
> parse error. This replicates the problem.
> {code}
> class Asdf {
> void run() {
> ['a', 'b'].stream()
> .<Map<Boolean, List<String>>, ?> collect(partitioningBy { it == 'a' })
> }
> }
> {code}
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