doesn't validate patterns correctly in destructuring target

[babel-bot]

Original issue submitted by @gsathya in babel/babel#5099

Input Code

var { ...{x =5 } } = {x : 1}; console.log(x);

REPL

Babel Configuration (.babelrc, package.json, cli command)

Presets - stage3

Expected Behavior

→ ./out.gn/x64.debug/d8 -harmony-object-rest-spread -e "var { ...{x =5 } } = {x : 1}; print(x);" 
1

Current Behavior

Syntax error

Possible Solution

Doesn't validate patterns correctly in destructuring target