merge revision(s) 57968,57969,57970: [Backport #13313]

	thread.c: thread_do_start

	* thread.c (thread_do_start): extract from a macro in
	  thread_start_func_2 for debugger.
	thread.c: Thread.start with Symbol

	* thread.c (thread_do_start): fix segfault at start with Symbol.
	  proc created by Symbol#to_proc does not have environment unless
	  using refinements.  [ruby-core:80147] [Bug #13313]
	Fiber also has same issue. [Bug #13313]

	* thread.c (rb_vm_proc_local_ep): added.

	* cont.c (rb_fiber_start): use rb_vm_proc_local_ep().


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@58003 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/cont.c b/cont.c
index 6760cb3504..ab4f2bc830 100644
--- a/cont.c
+++ b/cont.c
@@ -1277,7 +1277,7 @@ rb_fiber_start(void)
 	argv = (argc = cont->argc) > 1 ? RARRAY_CONST_PTR(args) : &args;
 	cont->value = Qnil;
 	th->errinfo = Qnil;
-	th->root_lep = rb_vm_ep_local_ep(vm_block_ep(&proc->block));
+	th->root_lep = rb_vm_proc_local_ep(cont->saved_thread.first_proc);
 	th->root_svar = Qfalse;
 	fib->status = RUNNING;