Merge pull request #13088 from igfoo/igfoo/getTypeParameterParentLabel

Kotlin: Small simplification

java/kotlin-extractor/src/main/kotlin/KotlinUsesExtractor.kt

@@ -1450,9 +1450,11 @@ open class KotlinUsesExtractor(
 
     fun getTypeParameterParentLabel(param: IrTypeParameter) =
         param.parent.let {
-            (it as? IrFunction)?.let { fn ->
-                if (this is KotlinFileExtractor)
-                    this.declarationStack.findOverriddenAttributes(fn)?.takeUnless {
+            when (it) {
+                is IrClass -> useClassSource(it)
+                is IrFunction ->
+                    (if (this is KotlinFileExtractor)
+                        this.declarationStack.findOverriddenAttributes(it)?.takeUnless {
                             // When extracting the `static fun f$default(...)` that accompanies `fun <T> f(val x: T? = defaultExpr, ...)`,
                             // `f$default` has no type parameters, and so there is no `f$default::T` to refer to.
                             // We have no good way to extract references to `T` in `defaultExpr`, so we just fall back on describing it
@@ -1461,10 +1463,8 @@ open class KotlinUsesExtractor(
                         }?.id
                     else
                         null
-            } ?:
-            when (it) {
-                is IrClass -> useClassSource(it)
-                is IrFunction -> useFunction(it, noReplace = true)
+                    ) ?:
+                    useFunction(it, noReplace = true)
                 else -> { logger.error("Unexpected type parameter parent $it"); null }
             }
         }