[NI] Make behaviour of anonymous functions consistent with lambdas

Fix completion of anonymous functions with expression body without expected type.
Premature completion led to losing type info from outer calls.
Also report type mismatches on empty lambda expressions.

KT-34729 In progress

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestGenerated.java

@@ -8469,6 +8469,11 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
             runTest("compiler/testData/diagnostics/tests/generics/kt30590.kt");
         }
 
+        @TestMetadata("kt34729.kt")
+        public void testKt34729() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/generics/kt34729.kt");
+        }
+
         @TestMetadata("kt5508.kt")
         public void testKt5508() throws Exception {
             runTest("compiler/testData/diagnostics/tests/generics/kt5508.kt");
@@ -10537,6 +10542,11 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
                 KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/inference/completion"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
             }
 
+            @TestMetadata("anonymousFunction.kt")
+            public void testAnonymousFunction() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/completion/anonymousFunction.kt");
+            }
+
             @TestMetadata("basic.kt")
             public void testBasic() throws Exception {
                 runTest("compiler/testData/diagnostics/tests/inference/completion/basic.kt");