Unterminated JSX contents on generic arrow function as field of parenthesized object literal

[magnushiie]

Babylon gives Unterminated JSX contents error when an arrow field is wrapped in an object literal which is wrapped in parentheses.

Input Code

Smallest example I could extract:

({ id: <T>(value) => value });

The real-world example would be (that's why the parentheses are necessary):

const functionReturningIdentityAsAField = () => ({ id: <T>(value: T): T => value });

Babylon/Babel Configuration

{
  plugins: [
    "jsx",
    "flow"
  ]
}

Expected Behavior

Parse without errors.

Current Behavior

  throw err;
  ^

SyntaxError: Unterminated JSX contents (2:29)
    at Parser.pp$5.raise (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:4373:13)
    at Parser.pp$9.jsxReadToken (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:6653:12)
    at Parser.<anonymous> (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:7028:21)
    at Parser.readToken (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:5853:22)
    at Parser.nextToken (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:764:19)
    at Parser.next (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:689:10)
    at Parser.eat (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:696:12)
    at Parser.pp.expect (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:1704:15)
    at Parser.pp$3.parseParenAndDistinguishExpression (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\
index.js:3767:8)
    at Parser.pp$3.parseExprAtom (D:\Projects\Test\babylon_bug\node_modules\babylon\lib\index.js:3642:19)

Your Environment

software	version
Babylon	6.16.1
node	7.5.0
Operating System	windows 10

[magnushiie]

Might be related to babel/babel-eslint#266