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https://issues.apache.org/jira/browse/GROOVY-8570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470699#comment-16470699
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mgroovy commented on GROOVY-8570:
---------------------------------
(For any converter (formatter/transformer) which the user is not required to
use (Java-to-Groovy, if there would still be support for e.g. var-as-def in
Groovy; Groovy-to-idiomatic-Groovy in any case), we would still need some
mechanism to inform the user he should apply the converter to his code.)
> Support Warnings in Groovy Compiler
> -----------------------------------
>
> Key: GROOVY-8570
> URL: https://issues.apache.org/jira/browse/GROOVY-8570
> Project: Groovy
> Issue Type: New Feature
> Components: Compiler
> Affects Versions: 3.0.0-alpha-3
> Reporter: mgroovy
> Priority: Major
>
> * To warn Java developers using e.g. non-idiomatic Groovy constructs which
> only exist to support copy-and-paste Java-to-Groovy code compatibility, The
> Groovy compiler should support compiler warnings in addition to compiler
> errors.
> * Warnings should by default only be emitted in special circumstances such
> as the one described above, and not spam developers with an endless stream
> of, often subjectve, messages on "how to use Groovy correctly".
> * Sample warnings:
> # WARNING: Using curly braces Java style array literals (\{...}) is not
> idiomatic Groovy. To avoid confusion with Groovy closures, it is recommended
> to use the performance-identical Groovy square bracket list literal syntax
> ([...]) instead.
> # WARNING: The 'var' keyword is currently only an alias to 'def' (i.e.
> Object) in Groovy. To get reassignment type safety use an explicit type
> instead.
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