Tests that nested import scripts in worker show correct stack on syntax error.
Message count: 1
invalidScript.js:1 Uncaught SyntaxError: Unexpected identifier 'TABLE' (at invalidScript.js:1:15)
at importScripts-3.js:1:1
at foo (importScripts-2.js:3:5)
at importScripts-2.js:5:1
at importScripts-1.js:1:1
(anonymous) @ importScripts-3.js:1
foo @ importScripts-2.js:3
(anonymous) @ importScripts-2.js:5
(anonymous) @ importScripts-1.js:1