Ensure escaped definitions are parsed properly.

[ben-eb]

Input:

.\31\ 0

Output:

{ type: 'selectors',
  rules:
   [ { type: 'class',
       rules: [],
       spaces: [Object],
       value: '',
       combinator: '',
       parent: [Circular] },
     { type: 'tag',
       rules: [],
       spaces: [Object],
       value: '\\3',
       combinator: '',
       parent: [Circular] },
     { type: 'tag',
       rules: [],
       spaces: [Object],
       value: '1',
       combinator: '',
       parent: [Circular] },
     { type: 'tag',
       rules: [Object],
       spaces: [Object],
       value: '\\',
       combinator: ' ',
       parent: [Circular] } ],
  spaces: { before: '', after: '' },
  parent:
   { type: 'root',
     selectors: [ [Circular] ],
     spaces: { before: '', after: '' } } }

This should be one class selector.