Set Thread.report_on_exception=true by default to report exceptions in Threads

* [Feature #14143] [ruby-core:83979]
* vm.c (vm_init2): Set Thread.report_on_exception to true.
* thread.c (thread_start_func_2): Add indication the message is caused
  by report_on_exception = true.
* spec/ruby: Specify the new behavior.
* test/ruby/test_thread.rb: Adapt and improve tests for
  Thread.report_on_exception and Thread#report_on_exception.
* test/ruby/test_thread.rb, test/ruby/test_exception.rb: Unset
  report_on_exception for tests expecting no extra output.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61183 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/vm.c b/vm.c
index cda304a078..83b0a9cffc 100644
--- a/vm.c
+++ b/vm.c
@@ -2280,6 +2280,7 @@ vm_init2(rb_vm_t *vm)
 {
     MEMZERO(vm, rb_vm_t, 1);
     rb_vm_living_threads_init(vm);
+    vm->thread_report_on_exception = 1;
     vm->src_encoding_index = -1;
 
     vm_default_params_setup(vm);