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https://issues.apache.org/jira/browse/GROOVY-11241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17794289#comment-17794289
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Eric Milles commented on GROOVY-11241:
--------------------------------------
https://github.com/apache/groovy/commit/c5cee21bd66909fc8ca800198c001d63849d8a77
> Regression in STC generics solution
> -----------------------------------
>
> Key: GROOVY-11241
> URL: https://issues.apache.org/jira/browse/GROOVY-11241
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 4.0.16
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.0-alpha-4
>
>
> The following code, which works in 4.0.14 and below, incorrectly produces an
> error in 4.0.16.
> Expected result: {{mapTry(Option::get)}} unwraps the {{Try<Option<Integer>>}}
> into a {{Try<Integer>}}
> https://www.javadoc.io/doc/io.vavr/vavr/0.10.4/io/vavr/control/Try.html
> Actual:
> {code}
> [Static type checking] - Incompatible generic argument types. Cannot assign
> io.vavr.control.Try<io.vavr.control.Option<java.lang.Integer>> to:
> io.vavr.control.Try<java.lang.Integer>
> {code}
> {code}
> import groovy.transform.CompileStatic
> import io.vavr.control.Option
> import io.vavr.control.Try
> @Grab('io.vavr:vavr:0.10.4')
> @CompileStatic
> class Repro {
> Option<Integer> option() {
> Option.of(3)
> }
> Try<Integer> repro() {
> Try.of { option() }
> .mapTry(Option::get)
> }
> }
> {code}
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