DONT_MERGE: Raise the severity for compiler/stdlib mismatch messages up to ERROR
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/diagnostics/StandardLibrarySpecialCompatibilityChecker.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/diagnostics/StandardLibrarySpecialCompatibilityChecker.kt
index 37c4eb1..649ae15 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/diagnostics/StandardLibrarySpecialCompatibilityChecker.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/diagnostics/StandardLibrarySpecialCompatibilityChecker.kt
@@ -45,7 +45,7 @@
 
                 val messageToReport = getMessageToReport(compilerVersion, stdlibVersion)
                 if (messageToReport != null) {
-                    messageCollector.report(CompilerMessageSeverity.STRONG_WARNING, messageToReport)
+                    messageCollector.report(CompilerMessageSeverity.ERROR, messageToReport)
                 }
 
                 return