Warn about mistyped phase names in CLI

compiler/cli/src/org/jetbrains/kotlin/cli/common/createPhaseConfig.kt

@@ -9,6 +9,8 @@ import org.jetbrains.kotlin.backend.common.phaser.AnyNamedPhase
 import org.jetbrains.kotlin.backend.common.phaser.CompilerPhase
 import org.jetbrains.kotlin.backend.common.phaser.PhaseConfig
 import org.jetbrains.kotlin.backend.common.phaser.toPhaseMap
+import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity
+import org.jetbrains.kotlin.cli.common.messages.MessageCollector
 import org.jetbrains.kotlin.config.CommonConfigurationKeys
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.config.CompilerConfigurationKey
@@ -54,5 +56,15 @@ private fun phaseSetFromConfiguration(
 ): Set<AnyNamedPhase> {
     val phaseNames = config.get(key) ?: emptySet()
     if ("ALL" in phaseNames) return phases.values.toSet()
-    return phaseNames.map { phases[it]!! }.toSet()
+    return phaseNames.mapNotNull {
+        phases[it] ?: run {
+            warn(config, "no phase named $it, ignoring")
+            null
+        }
+    }.toSet()
+}
+
+private fun warn(config: CompilerConfiguration, message: String) {
+    val messageCollector = config.get(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY) ?: MessageCollector.NONE
+    messageCollector.report(CompilerMessageSeverity.WARNING, message)
 }

compiler/testData/cli/jvm/nonExistingPhaseName.args

@@ -0,0 +1,5 @@
+-d
+$TEMP_DIR$
+-Xuse-ir
+-Xverbose-phases=qz,qq
+$TESTDATA_DIR$/simple.kt

compiler/testData/cli/jvm/nonExistingPhaseName.out

@@ -0,0 +1,3 @@
+warning: no phase named qz, ignoring
+warning: no phase named qq, ignoring
+OK

compiler/tests/org/jetbrains/kotlin/cli/CliTestGenerated.java

@@ -486,6 +486,11 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/jvm/nonExistingClassPathAndAnnotationsPath.args");
         }
 
+        @TestMetadata("nonExistingPhaseName.args")
+        public void testNonExistingPhaseName() throws Exception {
+            runTest("compiler/testData/cli/jvm/nonExistingPhaseName.args");
+        }
+
         @TestMetadata("nonExistingSourcePath.args")
         public void testNonExistingSourcePath() throws Exception {
             runTest("compiler/testData/cli/jvm/nonExistingSourcePath.args");