Make compile-time errors catchable

runtime/vm/compiler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 147 matching lines @@
 
 
 // Compile a function. Should call only if the function has not been compiled.
 //   Arg0: function object.
 DEFINE_RUNTIME_ENTRY(CompileFunction, 1) {
   const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
   ASSERT(!function.HasCode());
   const Error& error =
       Error::Handle(Compiler::CompileFunction(thread, function));
   if (!error.IsNull()) {
+    if (error.IsLanguageError()) {
+      Exceptions::ThrowSyntaxError(LanguageError::Cast(error));
+      UNREACHABLE();
+    }
     Exceptions::PropagateError(error);
   }
 }
 
 
 bool Compiler::CanOptimizeFunction(Thread* thread, const Function& function) {
   if (FLAG_support_debugger) {
     Isolate* isolate = thread->isolate();
     if (isolate->debugger()->IsStepping() ||
         isolate->debugger()->HasBreakpoint(function, thread->zone())) {
@@ skipping 2001 matching lines @@
 
 
 bool BackgroundCompiler::IsDisabled() {
   UNREACHABLE();
   return true;
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart