[GROOVY-10557] TypeChecked/CompileStatic tries to cast to wrong type in nested closure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.9, 2.5.16, 3.0.10
• Fix Version/s: 3.0.11
• Component/s: Static compilation, Static Type Checker
• Assignee: Eric Milles
• Reporter: Leonard Brünings
• Created: 29/Mar/22 16:01
• Updated: 24/Jul/22 15:05
• Resolved: 31/Mar/22 01:35

Description

The code

import groovy.transform.*
import java.util.function.Function

@CompileStatic
class Foo {
    
    final <T> T foo(Function<Reader, T> function)  {
        new StringReader("").withCloseable { reader ->
			function.apply(reader)
        }        
    }
    
    static void main(String... args) {
       println  new Foo().foo { it.text.empty }
    }
}

fails with

org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'true' with class 'java.lang.Boolean' to class 'java.io.StringReader'
	at Foo$_foo_closure1.doCall(Script1.groovy:10)
	at Foo$_foo_closure1.call(Script1.groovy)
	at Foo.foo(Script1.groovy:9)
	at Foo.main(Script1.groovy:15)

while it works fine with @CompileDynamic. As far as I can see this regression was introduced with 3.0.9.

(see Groovy Web Console as long as deployed version is 3.0.10)