Forgetting 'new' keyword causes node to crash

[tjlahr]

The following code causes my node repl to crash. While it's up to the developer to remember the 'new' keyword, it would be nice if the library threw a more intelligible error.

var Canvas = require('canvas');
var cvs = Canvas(100, 200);
Assertion failed: (handle->InternalFieldCount() > 0), function Wrap, file ../src/node_object_wrap.h, line 71.
Abort trap: 6

[LinusU]

Haha, this is still a problem, I'll fix it now 😆