Add json-superset feature

features.txt

@@ -77,6 +77,10 @@ numeric-separator-literal
 String.prototype.matchAll
 Symbol.matchAll
 
+# ECMAScript ⊃ JSON
+# https://github.com/tc39/proposal-json-superset
+json-superset
+
 # Intl.Locale
 # https://github.com/tc39/proposal-intl-locale
 Intl.Locale

test/language/literals/string/line-separator-eval.js

@@ -11,6 +11,7 @@ info: |
   All code points may appear literally in a string literal except for the
   closing quote code points, U+005C (REVERSE SOLIDUS), U+000D (CARRIAGE RETURN),
   and U+000A (LINE FEED).
+features: [json-superset]
 ---*/
 
 assert.sameValue(eval("'\u2028'"), "\u2028");

test/language/literals/string/line-separator.js

@@ -11,6 +11,7 @@ info: |
   All code points may appear literally in a string literal except for the
   closing quote code points, U+005C (REVERSE SOLIDUS), U+000D (CARRIAGE RETURN),
   and U+000A (LINE FEED).
+features: [json-superset]
 ---*/
 
 // U+2028 in strings; UTF8(0x2028) = 0xE2 0x80 0xA8

test/language/literals/string/paragraph-separator-eval.js

@@ -11,6 +11,7 @@ info: |
   All code points may appear literally in a string literal except for the
   closing quote code points, U+005C (REVERSE SOLIDUS), U+000D (CARRIAGE RETURN),
   and U+000A (LINE FEED).
+features: [json-superset]
 ---*/
 
 assert.sameValue(eval("'\u2029'"), "\u2029");

test/language/literals/string/paragraph-separator.js

@@ -11,6 +11,7 @@ info: |
   All code points may appear literally in a string literal except for the
   closing quote code points, U+005C (REVERSE SOLIDUS), U+000D (CARRIAGE RETURN),
   and U+000A (LINE FEED).
+features: [json-superset]
 ---*/
 
 // U+2029 in strings; UTF8(0x2029) = 0xE2 0x80 0xA9