fix 8117

src/compiler/emitter.ts

@@ -7879,7 +7879,7 @@ const _super = (function (geti, seti) {
                     node.parent &&
                     node.parent.kind === SyntaxKind.ArrowFunction &&
                     (<ArrowFunction>node.parent).body === node &&
-                    compilerOptions.target <= ScriptTarget.ES5) {
+                    languageVersion <= ScriptTarget.ES5) {
 
                     return false;
                 }

tests/baselines/reference/singleLineCommentInConciseArrowFunctionES3.js

@@ -0,0 +1,14 @@
+//// [singleLineCommentInConciseArrowFunctionES3.ts]
+function test() {
+    return () =>
+        // some comments here;
+        123;
+}
+
+//// [singleLineCommentInConciseArrowFunctionES3.js]
+function test() {
+    return function () {
+        // some comments here;
+        return 123;
+    };
+}

tests/baselines/reference/singleLineCommentInConciseArrowFunctionES3.symbols

@@ -0,0 +1,8 @@
+=== tests/cases/compiler/singleLineCommentInConciseArrowFunctionES3.ts ===
+function test() {
+>test : Symbol(test, Decl(singleLineCommentInConciseArrowFunctionES3.ts, 0, 0))
+
+    return () =>
+        // some comments here;
+        123;
+}

tests/baselines/reference/singleLineCommentInConciseArrowFunctionES3.types

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/singleLineCommentInConciseArrowFunctionES3.ts ===
+function test() {
+>test : () => () => number
+
+    return () =>
+>() =>        // some comments here;        123 : () => number
+
+        // some comments here;
+        123;
+>123 : number
+}

tests/cases/compiler/singleLineCommentInConciseArrowFunctionES3.ts

@@ -0,0 +1,5 @@
+function test() {
+    return () =>
+        // some comments here;
+        123;
+}