As of Compose 1.0.0-alpha01 both RowScope and ColumnScope are declared as object which allows methods inside it to be statically imported which causes a lot of confusion. Here is one such example:

@Composable
fun Example() {
  Box(modifier = Modifier.size(300.dp)) {
    Text("Some text", 
        // This modifier is being imported from RowScope for example and doesn't work here
        modifier = Modifier.gravity(Alignment.Center)
    )
  }
}

Instead these types of scopes should be interfaces to prevent static imports.