commit 4dcada2bf81687808611ec82b267e4977ad0ce2a
author Ben Konyi <bkonyi@google.com> Tue Jul 12 17:21:32 2022 +0000
committer Commit Bot <commit-bot@chromium.org> Tue Jul 12 17:21:32 2022 +0000
tree 7c3ebec40ca1a8afe87901a09905ee02349a0a2b
parent bdf8fcc1ab4e2372bda136455dad317947f78ffa

[ VM ] Print more useful error message when trying to run a program with no `main`

Fixes https://github.com/dart-lang/sdk/issues/49432

TEST=Manual verification

Change-Id: Iba652016dc62306a883587b05506ee76cc650c20
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251122
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>

runtime/vm/dart_api_impl.cc

diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index adac74b..32954d6 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -5503,8 +5503,10 @@
   // is not correct because main can be in the exported namespace of a library
   // or it could be a getter.
   if (tmp.IsNull()) {
-    return Api::NewError("%s: The binary program does not contain 'main'.",
-                         CURRENT_FUNC);
+    return Api::NewError(
+        "Invoked Dart programs must have a 'main' function defined:\n"
+        "https://dart.dev/guides/language/"
+        "language-tour#a-basic-dart-program");
   }
   library ^= tmp.ptr();
   IG->object_store()->set_root_library(library);