https://git.ruby-lang.org/ruby.git/commit/?id=6610b77ea8

From 6610b77ea85302e33d8cb0a2a082f8bd2b3e2f40 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 2 May 2019 21:16:27 +0000
Subject: merge revision(s) 66324: [Backport #15385]

	Modify insn list only when compiling

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67708 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/compile.c b/compile.c
index 417ee21..f4f371d 100644
--- a/compile.c
+++ b/compile.c
@@ -482,6 +482,7 @@ static TRACE *new_trace_body(rb_iseq_t *iseq, rb_event_flag_t event); https://github.com/ruby/ruby/blob/trunk/compile.c#L482
 
 static int iseq_compile_each(rb_iseq_t *iseq, LINK_ANCHOR *anchor, const NODE *n, int);
 static int iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
+static int iseq_setup_insn(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_optimize(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_insns_unification(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 
@@ -611,6 +612,20 @@ validate_labels(rb_iseq_t *iseq, st_table *labels_table) https://github.com/ruby/ruby/blob/trunk/compile.c#L612
 }
 
 VALUE
+rb_iseq_compile_ifunc(rb_iseq_t *iseq, const struct vm_ifunc *ifunc)
+{
+    DECL_ANCHOR(ret);
+    INIT_ANCHOR(ret);
+
+    (*ifunc->func)(iseq, ret, ifunc->data);
+
+    ADD_INSN(ret, ISEQ_COMPILE_DATA(iseq)->last_line, leave);
+
+    CHECK(iseq_setup_insn(iseq, ret));
+    return iseq_setup(iseq, ret);
+}
+
+VALUE
 rb_iseq_compile_node(rb_iseq_t *iseq, const NODE *node)
 {
     DECL_ANCHOR(ret);
@@ -723,6 +738,7 @@ rb_iseq_compile_node(rb_iseq_t *iseq, const NODE *node) https://github.com/ruby/ruby/blob/trunk/compile.c#L738
 	validate_labels(iseq, labels_table);
     }
 #endif
+    CHECK(iseq_setup_insn(iseq, ret));
     return iseq_setup(iseq, ret);
 }
 
@@ -1248,7 +1264,7 @@ iseq_insert_nop_between_end_and_cont(rb_iseq_t *iseq) https://github.com/ruby/ruby/blob/trunk/compile.c#L1264
 }
 
 static int
-iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
+iseq_setup_insn(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 {
     if (RTEST(ISEQ_COMPILE_DATA(iseq)->err_info))
 	return COMPILE_NG;
@@ -1281,6 +1297,15 @@ iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor) https://github.com/ruby/ruby/blob/trunk/compile.c#L1297
     debugs("[compile step 3.4 (iseq_insert_nop_between_end_and_cont)]\n");
     iseq_insert_nop_between_end_and_cont(iseq);
 
+    return COMPILE_OK;
+}
+
+static int
+iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
+{
+    if (RTEST(ISEQ_COMPILE_DATA(iseq)->err_info))
+	return COMPILE_NG;
+
     debugs("[compile step 4.1 (iseq_set_sequence)]\n");
     if (!iseq_set_sequence(iseq, anchor)) return COMPILE_NG;
     if (compile_debug > 5)
diff --git a/version.h b/version.h
index d59d699..f6fa5d4 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.5.6"
-#define RUBY_RELEASE_DATE "2019-04-30"
-#define RUBY_PATCHLEVEL 165
+#define RUBY_RELEASE_DATE "2019-05-03"
+#define RUBY_PATCHLEVEL 166
 
 #define RUBY_RELEASE_YEAR 2019
-#define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 30
+#define RUBY_RELEASE_MONTH 5
+#define RUBY_RELEASE_DAY 3
 
 #include "ruby/version.h"
 
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