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https://issues.apache.org/jira/browse/GROOVY-9796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles reassigned GROOVY-9796:
-----------------------------------
Assignee: Eric Milles
> Static type checker doesn't backtrack when solving generics
> -----------------------------------------------------------
>
> Key: GROOVY-9796
> URL: https://issues.apache.org/jira/browse/GROOVY-9796
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 3.0.6
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Major
>
> When a method pipeline involves generics, the static type checker is greedy
> and tends to be overly specific, producing errors when the correct answer
> involves relaxing to a common bound.
> {code:groovy}
> @CompileStatic
> Number returnANumber() {
> Number number = Optional.of(1234 as Integer) // should infer
> Optional<Number>
> orElse(42.0 as Double)
> }
> {code}
> {code}
> [Static type checking] - Cannot find matching method
> java.util.Optional#orElse(java.lang.Double). Please check if the declared
> type is correct and if the method exists.
> {code}
> Explicitly inserting a type witness {{Optional.<Number>of}} works.
> Note: This _might_ be a duplicate of GROOVY-8103, but I'm unable to tell
> precisely. 3.0.6 was released one week after it was marked resolved.
> GROOVY-8961 is marked fixed in 3.0.6, but I'm having the problem there.
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