From 7b2bea42a245f2e80b5d2700963fd6b143f6d6b8 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 2 Sep 2020 23:12:22 +0900
Subject: Unfreeze string-literal-only interpolated string-literal

[Feature #17104]
---
 compile.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'compile.c')

diff --git a/compile.c b/compile.c
index 797a170f5f..0d2d7fbf73 100644
--- a/compile.c
+++ b/compile.c
@@ -3828,8 +3828,16 @@ static int
 compile_dstr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node)
 {
     int cnt;
-    CHECK(compile_dstr_fragments(iseq, ret, node, &cnt));
-    ADD_INSN1(ret, nd_line(node), concatstrings, INT2FIX(cnt));
+    if (!node->nd_next) {
+        VALUE lit = rb_fstring(node->nd_lit);
+        const int line = (int)nd_line(node);
+        ADD_INSN1(ret, line, putstring, lit);
+        RB_OBJ_WRITTEN(iseq, Qundef, lit);
+    }
+    else {
+        CHECK(compile_dstr_fragments(iseq, ret, node, &cnt));
+        ADD_INSN1(ret, nd_line(node), concatstrings, INT2FIX(cnt));
+    }
     return COMPILE_OK;
 }
 
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