Forbid default inline/crossinline suspend parameters

compiler/frontend/src/org/jetbrains/kotlin/resolve/inline/InlineAnalyzerExtension.kt

@@ -18,6 +18,8 @@ package org.jetbrains.kotlin.resolve.inline
 
 import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.coroutines.hasSuspendFunctionType
+import org.jetbrains.kotlin.coroutines.isSuspendLambda
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.isInlineOnlyOrReifiable
 import org.jetbrains.kotlin.diagnostics.Errors
@@ -109,6 +111,18 @@ class InlineAnalyzerExtension(
                         checkDefaultValue(trace, parameter, ktParameter)
                     }
                 }
+                // Report unsupported error on inline/crossinline suspend lambdas with default values.
+                if (functionDescriptor.isSuspend &&
+                    InlineUtil.isInlineParameterExceptNullability(parameter) &&
+                    parameter.hasSuspendFunctionType
+                ) {
+                    trace.report(
+                        Errors.NOT_YET_SUPPORTED_IN_INLINE.on(
+                            ktParameter,
+                            "Suspend functional parameters with default values"
+                        )
+                    )
+                }
             }
         }
     }

compiler/testData/diagnostics/tests/inline/defaultLambdaInlineSuspend.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_PARAMETER -UNUSED_VARIABLE -REDUNDANT_INLINE_SUSPEND_FUNCTION_TYPE -NOTHING_TO_INLINE
+// SKIP_TXT
+
+suspend inline fun test1(<!NOT_YET_SUPPORTED_IN_INLINE!>s : suspend () -> String = { "OK" }<!>) {}
+suspend inline fun test2(s : () -> String = { "OK" }) {}
+suspend inline fun test3(<!NOT_YET_SUPPORTED_IN_INLINE!>crossinline s : suspend () -> String = { "OK" }<!>) {}
+suspend inline fun test4(crossinline s : () -> String = { "OK" }) {}
+suspend inline fun test5(noinline s : suspend () -> String = { "OK" }) {}
+suspend inline fun test6(noinline s : () -> String = { "OK" }) {}
+

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -11558,6 +11558,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("defaultLambdaInlineSuspend.kt")
+            public void testDefaultLambdaInlineSuspend() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/inline/defaultLambdaInlineSuspend.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("defaultLambdaInlining.kt")
             public void testDefaultLambdaInlining() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/inline/defaultLambdaInlining.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsUsingJavacTestGenerated.java

@@ -11558,6 +11558,12 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
                 doTest(fileName);
             }
 
+            @TestMetadata("defaultLambdaInlineSuspend.kt")
+            public void testDefaultLambdaInlineSuspend() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/inline/defaultLambdaInlineSuspend.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("defaultLambdaInlining.kt")
             public void testDefaultLambdaInlining() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/inline/defaultLambdaInlining.kt");