[ffi] missing type argument in @Native crashes the compiler

[dcharkes]

@Native() // should have been @Native<Void Function()>
external void foo();

crashes the compiler

type 'DynamicType' is not a subtype of type 'FunctionType' in type cast

#0      FfiNativeTransformer.visitProcedure (package:vm/transformations/ffi/native.dart:671:58)
#1      Procedure.accept (package:kernel/ast.dart:3590:40)
#2      Transformer.transform (package:kernel/visitor.dart:1801:21)
#3      Transformer.transformList (package:kernel/visitor.dart:1836:18)
#4      Library.transformChildren (package:kernel/ast.dart:614:7)
#5      Transformer.defaultTreeNode (package:kernel/visitor.dart:1858:10)
#6      TreeVisitor.visitLibrary (package:kernel/visitor.dart:513:35)
#7      FfiTransformer.visitLibrary (package:vm/transformations/ffi/common.dart:530:26)
#8      FfiNativeTransformer.visitLibrary (package:vm/transformations/ffi/native.dart:95:26)
#9      List.forEach (dart:core-patch/growable_array.dart:416:8)
#10     transformLibraries (package:vm/transformations/ffi/native.dart:41:13)
#11     VmTarget.performModularTransformationsOnLibraries (package:vm/target/vm.dart:179:26)
#12     KernelTarget.runBuildTransformations (package:front_end/src/fasta/kernel/kernel_target.dart:1568:19)
#13     KernelTarget.buildComponent.<anonymous closure> (package:front_end/src/fasta/kernel/kernel_target.dart:638:7)
<asynchronous suspension>
#14     withCrashReporting (package:front_end/src/fasta/crash.dart:136:12)
<asynchronous suspension>
#15     IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:413:23)
<asynchronous suspension>
#16     computeKernel (package:frontend_server/compute_kernel.dart:434:9)
<asynchronous suspension>
#17     main (file:///b/s/w/ir/x/w/sdk/utils/bazel/kernel_worker.dart:32:18)
<asynchronous suspension>
Target //experimental/users/iinozemtsev/flutter_ffi/java/com/google/android/apps/flutterffi:flutterffi failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 4.323s, Forge stats: 0/1 actions cached, 0.8s CPU used, 0.0s queue time, 0.0 MB ObjFS output (novel bytes: 0.0 MB), 0.0 MB local output, Critical Path: 2.07s, Remote (0.00% of the time): [queue: 0.00%, setup: 0.00%, process: 0.00%]
ERROR: Build did NOT complete successfully
INFO: Streaming build results to: [http://sponge2/61bf32f9-abf1-4f5c-ac21-ffc11828d43b](https://sponge2.corp.google.com/61bf32f9-abf1-4f5c-ac21-ffc11828d43b)
iblaze ERROR 12:35:48 blaze build failed: exit status 1

[faizan003]

i want to work on this

[mraleph]

@faizan003 be warned that next time you will go across the repo posting meaningless ChatGPT (or similar) generated answers you will get banned from organization.