To reproduce:

1. In a new project, open any script with Visual Studio 2017
2. Create a class field float[] array;
3. Try writing "arr" and then press [ or ] to autocomplete the name
4. Try writing "array = new fl" and then press [ or ] to autocomplete the type

Expected: pressing [ or ] to autocomplete works after "new" keyword

Reproduced in VS 14.0.25431.01, VS 15.2.26430.16