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https://issues.apache.org/jira/browse/GROOVY-11681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Milles reassigned GROOVY-11681:
------------------------------------
Assignee: Eric Milles
> Return statement throws a compile error inside a closure
> --------------------------------------------------------
>
> Key: GROOVY-11681
> URL: https://issues.apache.org/jira/browse/GROOVY-11681
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Affects Versions: 5.0.0-beta-1
> Reporter: Saravanan
> Assignee: Eric Milles
> Priority: Major
>
>
> I am not sure what's going on here, the first call to myOther() succeeds
> during compilation, but the call to the submit method shows this error (after
> static compile was applied, during class gen)
> {code:java}
> import java.util.concurrent.Callable;
> import java.util.concurrent.Executors;
> public class RecordTesting {
> public <T> T myOther(Callable<T> callable) {
> }
> public void myFunction() {
> myOther(() -> {
> return "blah";
> })
> Executors.newSingleThreadExecutor().submit(() -> {
> return "blah";
> });
> }
> }
> {code}
>
> {noformat}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> General error during instruction selection: Cannot use return statement with
> an expression on a method that returns void
> . At [17:13]
> testdata/plugins/records/RecordTesting.javaorg.codehaus.groovy.syntax.RuntimeParserException:
> Cannot use return statement with an expression on a method that returns void
> . At [17:13] testdata/plugins/records/RecordTesting.java
> at
> org.codehaus.groovy.classgen.AsmClassGenerator.throwException(AsmClassGenerator.java:2450)
> at
> org.codehaus.groovy.classgen.asm.StatementWriter.writeReturn(StatementWriter.java:603)
> at
> org.codehaus.groovy.classgen.AsmClassGenerator.visitReturnStatement(AsmClassGenerator.java:885)
> at
> org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:73)
> at
> org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:91)
> at
> org.codehaus.groovy.classgen.asm.sc.StaticTypesStatementWriter.writeBlockStatement(StaticTypesStatementWriter.java:79)
> at
> org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:815)
> at
> org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:72){noformat}
> The error goes away if I cast the lambda to a callable like this
> {code:java}
> Executors.newSingleThreadExecutor().submit((Callable<String>) () -> { return
> "blah"; });
> {code}
>
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