[AST] Add method to concatenate AstRawStrings

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index bbfe7b53efccf6c4d6a88b207f8ed823abdeb7b1..376cc9b9e9afca23b366671121d718a7c5f62076 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -1491,6 +1491,7 @@ enum ParserFlag {
   kAllowHarmonyRestrictiveGenerators,
   kAllowHarmonyTrailingCommas,
   kAllowHarmonyClassFields,
+  kAllowHarmonyPrivateClassFields,
 };
 
 enum ParserSyncTestResult {
@@ -1517,6 +1518,8 @@ void SetParserFlags(i::ParserBase<Traits>* parser,
       flags.Contains(kAllowHarmonyTrailingCommas));
   parser->set_allow_harmony_class_fields(
       flags.Contains(kAllowHarmonyClassFields));
+  parser->set_allow_harmony_private_class_fields(
+      flags.Contains(kAllowHarmonyPrivateClassFields));
 }
 
 
@@ -4727,6 +4730,102 @@ TEST(ClassFieldsErrors) {
                     arraysize(with_async));
 }
 
+TEST(ClassPrivatesNoErrors) {
+  // clang-format off
+  // Tests proposed class private fields syntax.
+  const char* class_body_contexts[][2] = {{"(class {", "});"},
+                                   {"(class extends Base {", "});"},
+                                   {"class C {", "}"},
+                                   {"class C extends Base {", "}"},
+                                   {NULL, NULL}};
+  const char* class_body_data[] = {
+    // Basic syntax
+    "#a = 0;",
+    "#a = 0; #b",
+    "#a = 0; b(){}",
+    "#a = 0; *b(){}",
+    "#a = 0; ['b'](){}",
+    "#a;",
+    "#a; #b;",
+    "#a; b(){}",
+    "#a; *b(){}",
+    "#a; ['b'](){}",
+
+    // ASI
+    "#a = 0\n",
+    "#a = 0\n #b",
+    "#a = 0\n b(){}",
+    "#a\n",
+    "#a\n #b\n",
+    "#a\n b(){}",
+    "#a\n *b(){}",
+    "#a\n ['b'](){}",
+
+    // Misc edge cases
+    "#yield",
+    "#yield = 0",
+    "#yield\n #a",
+    NULL
+  };
+  // clang-format on
+
+  static const ParserFlag flags[] = {kAllowHarmonyPrivateClassFields};
+  RunParserSyncTest(class_body_contexts, class_body_data, kSuccess, NULL, 0,
+                    flags, arraysize(flags));
+
+  // clang-format off
+  const char* declaration_contexts[][2] = {{"(class { #x;", "});"},
+                                           {"(class extends Base { #x;", "});"},
+                                           {"class C { #x;", "}"},
+                                           {"class C extends Base { #x;", "}"},
+                                           {"(class {", "\n#x;});"},
+                                           {NULL, NULL}};
+  const char* declaration_bodies[] = {
+    "m(){ ++#x; return #x; }",
+    "m(o){ ++#x; return o.#x; }",
+    "m(){ #x = 0; }",
+    "m(o){ o.#x = 0; }",
+    "m(){ ({a: #x} = {a: 0}); }",
+    "m(){ ({a: o.#x} = {a: 0}); }",
+    "static m(){ ++#x; return #x; }",
+    "static m(o){ ++#x; return o.#x; }",
+    "static m(){ #x = 0; }",
+    "static m(o){ o.#x = 0; }",
+    "static m(){ ({a: #x} = {a: 0}); }",
+    "static m(){ ({a: o.#x} = {a: 0}); }",
+    NULL
+  };
+  // clang-format on
+
+  RunParserSyncTest(declaration_contexts, declaration_bodies, kSuccess, NULL, 0,
+                    flags, arraysize(flags));
+}
+
+TEST(ClassPrivatesErrors) {
+  // clang-format off
+  // Tests proposed class private fields syntax.
+  const char* context_data[][2] = {{"(class {", "});"},
+                                   {"(class extends Base {", "});"},
+                                   {"class C {", "}"},
+                                   {"class C extends Base {", "}"},
+                                   {NULL, NULL}};
+  // clang-format off
+  const char* class_body_data[] = {
+    "#x = 0\n *a(){}",
+    "#['x'] = 0;",
+    "#['x'];",
+    "#x; #x;",
+    "#x = 0; #x;",
+    "#x = 0; #x = 0",
+    NULL
+  };
+  // clang-format on
+
+  static const ParserFlag without_async[] = {kAllowHarmonyPrivateClassFields};
+  RunParserSyncTest(context_data, class_body_data, kError, NULL, 0,
+                    without_async, arraysize(without_async));
+}
+
 TEST(ClassExpressionErrors) {
   const char* context_data[][2] = {{"(", ");"},
                                    {"var C = ", ";"},