IssueTracker

Android Studio Build:

Android Studio 4.2 Canary 1
Build #AI-201.7223.91.42.6568795, built on June 8, 2020
Runtime version: 1.8.0_242-release-1644-b3-6222593 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 5.3.0-59-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 1927M
Cores: 8
Registry: ide.new.welcome.screen.force=true, debugger.watches.in.variables=false
Non-Bundled Plugins: CheckStyle-IDEA, siosio.kodkod
Current Desktop: ubuntu:GNOME

• Version of Gradle Plugin: 4.2.0-alpha01
• Version of Gradle: 6.5-rc-1
• OS: Ubuntu 20.04

Steps to Reproduce: try using a function reference instead of a lambda expression to satisfy a @Composable function type.

@Preview
@Composable
fun ListifyLambda() {
  AdapterList(data = listOf("foo", "bar", "goo")) {
    ListItem(it)
  }
}

@Preview
@Composable
fun ListifyFnRef() {
  AdapterList(data = listOf("foo", "bar", "goo"), itemCallback = ::ListItem)
}

@Composable
fun ListItem(item: String) {
  Text(item)
}

ListifyLambda() and ListifyFnRef() should be equivalent. However, only ListifyLambda() compiles, when using dev13. ListifyFnRef() fails to compile with:

Type mismatch: inferred type is KFunction1<String, Unit> but (String) -> Unit was expected

Normally, Kotlin transforms those automatically, and it still does when they are not @Composable.

The attached project contains the above code snippet, though ListifyFnRef() is commented out, so you can see that ListifyLambda() works.

Thanks for considering this!