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https://issues.apache.org/jira/browse/GROOVY-10792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624019#comment-17624019
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Eric Milles edited comment on GROOVY-10792 at 10/25/22 8:04 PM:
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{{ClosureWriter}} does this, so it requires STC or SC to make it work:
{code:java}
// GROOVY-9971: closure return type is mapped to Groovy cast by classgen
ClassNode returnType = expression.getNodeMetaData(INFERRED_RETURN_TYPE);
if (returnType == null) returnType = ClassHelper.OBJECT_TYPE; // not
STC or unknown path
{code}
You can do "!!buffer" or "(boolean) buffer" or "buffer as boolean" or
"!buffer.isEmpty()".
was (Author: emilles):
{{ClosureWriter}} does this, so it requires STC or SC to make it work:
{code:java}
// GROOVY-9971: closure return type is mapped to Groovy cast by classgen
ClassNode returnType = expression.getNodeMetaData(INFERRED_RETURN_TYPE);
if (returnType == null) returnType = ClassHelper.OBJECT_TYPE; // not
STC or unknown path
{code}
You can do "!!buffer" or "(boolean) buffer" or "buffer as boolean".
> Declared generic parameter on method not transferred to Closure
> ---------------------------------------------------------------
>
> Key: GROOVY-10792
> URL: https://issues.apache.org/jira/browse/GROOVY-10792
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 4.0.6
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Minor
>
> This is probably a duplicate, but I'm not sure which of.
> I'm using Awaitility's {{until(Callable<Boolean>)}} and passing it a closure:
> {code:groovy}
> List<String> buffer = []
> ...
> await().until { buffer }
> {code}
> Expected behavior: {{buffer}} is coerced to a boolean using Groovy truth.
> Actual behavior:
> {code}
> java.lang.ClassCastException: class java.util.ArrayList cannot be cast to
> class java.lang.Boolean
> {code}
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