[jira] [Created] (GROOVY-8439) @CompileStatic cannot compile generic class's static method

["Robert Papp (JIRA)" <ji...@apache.org>]

Robert Papp created GROOVY-8439:
-----------------------------------

             Summary: @CompileStatic cannot compile generic class's static method
                 Key: GROOVY-8439
                 URL: https://issues.apache.org/jira/browse/GROOVY-8439
             Project: Groovy
          Issue Type: Bug
          Components: Static compilation
    Affects Versions: 2.4.12
         Environment: Windows 10, IRL @CompileStatic applied via groovyOptions.configurationScript:
withConfig(configuration) { ast(groovy.transform.CompileStatic) }
            Reporter: Robert Papp
            Priority: Blocker


Below code is a simplification of a Gradle API + Android Gradle Plugin consuming code:
{code}
@CompileStatic
class Test<T extends Task> {

	static def something(Task task, Collection<BaseVariant> variants) {
		variants
				.collectMany {it.sourceFolders}
				.collect {ConfigurableFileTree tree ->
			task.buildDir.toPath().relativize(tree.dir.toPath()).toString() + File.separator
		}
	}
}

interface BaseVariant {

	List<ConfigurableFileTree> getSourceFolders()
}

interface ConfigurableFileTree {

	File getDir()
}

interface Task {

	File getBuildDir()
}
{code}

Removing {{<T extends Task>}} makes it compile, otherwise:
{code}

test\src\main\groovy\Test.groovy: 8: Expected parameter of type Task but got ConfigurableFileTree
 @ line 8, column 15.
   				.collect {ConfigurableFileTree tree ->
                 ^

test\src\main\groovy\Test.groovy: 9: [Static type checking] - No such property: dir for class: Task
 @ line 9, column 38.
   			task.buildDir.toPath().relativize(tree.dir.toPath()).toString() + File.separator
                                        ^

test\src\main\groovy\Test.groovy: 9: [Static type checking] - Cannot find matching method java.nio.file.Path#relativize(java.lang.Object). Please check if the declared type is right and if the method exists.
 @ line 9, column 4.
   			task.buildDir.toPath().relativize(tree.dir.toPath()).toString() + File.separator
      ^

3 errors

:checkstyle:compileGroovy FAILED
{code}

So far I haven't found a workaround other than removing generics!



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