From 21b2487290ff0afb3dda07237732f4d953f9521b Mon Sep 17 00:00:00 2001
From: Zalim Bashorov <zalim.bashorov@jetbrains.com>
Date: Wed, 17 Jul 2019 21:45:05 +0300
Subject: [PATCH] Minor: add an additional message for further investigation
 EA-141821

---
 .../src/org/jetbrains/kotlin/js/naming/encodeSignature.kt      | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/js/js.frontend/src/org/jetbrains/kotlin/js/naming/encodeSignature.kt b/js/js.frontend/src/org/jetbrains/kotlin/js/naming/encodeSignature.kt
index e9722c7c413..a66fd961c70 100644
--- a/js/js.frontend/src/org/jetbrains/kotlin/js/naming/encodeSignature.kt
+++ b/js/js.frontend/src/org/jetbrains/kotlin/js/naming/encodeSignature.kt
@@ -33,7 +33,8 @@ fun encodeSignature(descriptor: CallableDescriptor): String {
     val usedTypeParameters = currentParameters.toMutableSet()
     val typeParameterNamer = { typeParameter: TypeParameterDescriptor ->
         usedTypeParameters += typeParameter.original
-        typeParameterNames[typeParameter.original]!!
+        typeParameterNames[typeParameter.original]
+            ?: error("${typeParameter.original} is not found when encode the signature of $descriptor.")
     }
 
     val receiverParameter = descriptor.extensionReceiverParameter