Properties after an async method gets "Parsing error"

[daltones]

ESLint: v3.6.1
ECMAVersion: 2017

This code:

var foo = {
  async bar() {
    await 1;
  },
  baz: true
};

Outputs this:

<text>
  5:6  error  Parsing error: Unexpected token :

✖ 1 problem (1 error, 0 warnings)

The problem occurs just with regular properties declared after a async method.

It can be reproduced with:

echo 'var foo = {async bar(){await 1;}, baz: true};' | eslint --no-eslintrc --stdin --parser-options='ecmaVersion:2017'

[xjamundx]

Verified in 3.3.1

> require('./espree.js').parse('var foo = { async bar() { await 1}, baz: true }', { ecmaVersion: 8 })
SyntaxError: Unexpected token :
    at Parser.instance.raise.instance.raiseRecoverable (/Users/jamuferguson/dev/espree/espree.js:406:19)
    at Parser.instance.unexpected (/Users/jamuferguson/dev/espree/espree.js:439:14)
    at Parser.pp$3.parsePropertyValue (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:2140:12)
    at Parser.instance.parseObj (/Users/jamuferguson/dev/espree/espree.js:389:18)
    at Parser.pp$3.parseExprAtom (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1930:19)
    at Parser.pp$3.parseExprSubscripts (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1817:21)
    at Parser.pp$3.parseMaybeUnary (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1794:19)
    at Parser.pp$3.parseExprOps (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1736:21)
    at Parser.pp$3.parseMaybeConditional (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1719:21)
    at Parser.pp$3.parseMaybeAssign (/Users/jamuferguson/dev/espree/node_modules/acorn/dist/acorn.js:1696:21)

works in acorn

> require('acorn').parse('var foo = { async bar() { await 1}, baz: true }', { ecmaVersion: 8 })
Node {
  type: 'Program',
  start: 0,
  end: 47,
  body: 
   [ Node {
       type: 'VariableDeclaration',
       start: 0,
       end: 47,
       declarations: [Object],
       kind: 'var' } ],
  sourceType: 'script' }

[xjamundx]

Also verified properties before work fine.

> require('./espree.js').parse('var foo = { eggs: true, async bar() { await 1 } }', { ecmaVersion: 8 })
Node {