Paul King commented on GROOVY-8580:

Previous discussion:


> CLONE - Support `var` keyword of Java10 (finalise behavior of keyword under 
> @CompileStatic)
> -------------------------------------------------------------------------------------------
>                 Key: GROOVY-8580
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8580
>             Project: Groovy
>          Issue Type: New Feature
>            Reporter: Daniel Sun
>            Priority: Blocker
>             Fix For: 3.x
> As part of GROOVY-8498 there is now support for the {{var}} keyword to 
> provide compatibility with:
> http://openjdk.java.net/jeps/286 (Java 10)
> http://openjdk.java.net/jeps/323 (targeted for Java 11)
> For dynamic Groovy, {{var}} is an alias for {{def}}. Under 
> {{@CompileStatic}}, there are three fairly obvious potential behaviors that 
> could make sense for Groovy:
> * a direct alias for {{def}} in which case normal Groovy flow typing would 
> apply (this is currently what is implemented but is more flexible than what 
> Java developers might expect)
> * similar to the alias for {{def}} in that it allows the inferred type to 
> change as further instructions are executed but it would only be allowed to 
> change to sub-types of the initially inferred type (needs further 
> investigation but if possible would combine some of the nice aspects of 
> Groovy def and Java var behavior)
> * a direct equivalent of Java (this would be the most work and would differ 
> greatly from Groovy behavior and in general would be hard to marry up with 
> Groovy semantics)
> We need to finalize the behavior we want before releasing non-alpha versions 
> of Groovy 3.

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