Numbers as map key produces errors #534
Description
First off, thank you for adding support for sass maps!
I found some errors using more complex ones ie.
Throws an unclosed parenthesis error
$sprites: (139: (width: 96, height: 139, x: 0, y: 0, url: 'test/build/image-d65510.png'), 140: (width: 96, height: 140, x: 0, y: 139, url: 'test/build/image-d65510.png'));
In 3.0rc2, complex maps were not supported at all. I found chaining map_merges did work! However, my workaround also throws unclosed parenthesis errors in 3.0rc4.
$sprites: (); $sprites: map_merge($sprites,(139: (width: 96, height: 139, x: 0, y: 0, url: 'test/build/image-d65510.png'))); $sprites: map_merge($sprites,(140: (width: 96, height: 140, x: 0, y: 139, url: 'test/build/image-d65510.png')));