From 4cf83614d2204a4446171d0b677748e9896bbc62 Mon Sep 17 00:00:00 2001
From: sksamuel <sam@sksamuel.com>
Date: Fri, 29 Jan 2021 14:00:02 -0600
Subject: [PATCH] Allow registration of custom Show typeclasses #2021

---
 .../commonMain/kotlin/io/kotest/assertions/show/Show.kt    | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kotest-assertions/kotest-assertions-shared/src/commonMain/kotlin/io/kotest/assertions/show/Show.kt b/kotest-assertions/kotest-assertions-shared/src/commonMain/kotlin/io/kotest/assertions/show/Show.kt
index 8bb962efc40..b044eabd46a 100644
--- a/kotest-assertions/kotest-assertions-shared/src/commonMain/kotlin/io/kotest/assertions/show/Show.kt
+++ b/kotest-assertions/kotest-assertions-shared/src/commonMain/kotlin/io/kotest/assertions/show/Show.kt
@@ -74,8 +74,11 @@ expect fun <A : Any> platformShow(a: A): Show<A>?
 @Suppress("UNCHECKED_CAST")
 fun <T : Any> commonShowFor(t: T): Show<T> {
    // lookup a show from the registered typeclasses
-   val kclass = Shows.all().keys.firstOrNull { it.isInstance(t) }
-   if (kclass != null) Shows.all()[kclass] as Show<T>
+   val kclass: KClass<*>? = Shows.all().keys.firstOrNull { it.isInstance(t) }
+   if (kclass != null) {
+      val show: Show<*>? = Shows.all()[kclass]
+      return show as Show<T>
+   }
    // this won't work in JS or native, so they'll get the boring old toString version
    if (io.kotest.mpp.reflection.isDataClass(t::class)) return dataClassShow<T>()
    return DefaultShow