From 017cd3a0f6c0cfa43d045ef5ae66b3d70a2758b2 Mon Sep 17 00:00:00 2001
From: Anton Bannykh <Anton.Bannykh@jetbrains.com>
Date: Tue, 12 Mar 2019 20:08:39 +0300
Subject: [PATCH] IR: more verbose unsatisfied phase requirement reporting

---
 .../jetbrains/kotlin/backend/common/phaser/CompilerPhase.kt  | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/CompilerPhase.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/CompilerPhase.kt
index 275ce8a2799..ecdfbfdd3b9 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/CompilerPhase.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/CompilerPhase.kt
@@ -81,7 +81,10 @@ abstract class AbstractNamedPhaseWrapper<in Context : CommonBackendContext, Inpu
             return input as Output
         }
 
-        assert(phaserState.alreadyDone.containsAll(prerequisite))
+        assert(phaserState.alreadyDone.containsAll(prerequisite)) {
+            "Lowering $name: phases ${(prerequisite - phaserState.alreadyDone).map { it.name }} are required, but not satisfied"
+        }
+
         context.inVerbosePhase = this in phaseConfig.verbose
 
         runBefore(phaseConfig, context, input)