"Cannot read property 'flags' of undefined" error when compiling nested array destruction

[seanchas116]

Hi,

I found tsc crashes when compiling nested array destruction in function parameter (example below).

TypeScript version

1.8.0-dev.20151024 (installed via npm install typescript@next)

Example Source

const nestedArray = [[[1, 2]], [[3, 4]]];

nestedArray.forEach(([[a, b]]) => {
  console.log(a, b);
});

Command

tsc index.ts

Trace

/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:30338
                throw e;
                ^

TypeError: Cannot read property 'flags' of undefined
    at getSymbolLinks (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:10715:23)
    at assignBindingElementTypes (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17679:25)
    at assignTypeToParameterAndFixTypeParameters (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17689:17)
    at assignContextualParameterTypes (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17666:17)
    at checkFunctionExpressionOrObjectLiteralMethod (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17860:29)
    at checkExpressionWorker (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:18503:28)
    at checkExpression (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:18445:42)
    at checkExpressionWithContextualType (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:18399:26)
    at checkApplicableSignature (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17162:31)
    at chooseOverload (/Users/seanchas116/Repos/seanchas116/typescript-destructuring-test/node_modules/typescript/lib/tsc.js:17448:30)

[mhegazy]

thanks @seanchas116!