How to reproduce:
1. Import users attached assets (Source shader, UsePass shader and a material)
2. Notice that Console produces two errors regarding Shader syntax. One for "ExampleSourceShader", another for "ExampleUsePass" shader that references to "ExampleSourceShader"
3. Fix the Source shader syntax error (uncomment 11th line of "ExampleSourceShader")

Expected result: Both errors are gone, since Source shader syntax error is fixed
Actual result: "ExampleUsePass" is still shown as having a syntax error in Shader, although its refrenced shader was fixed

Notes:
1. Reimporting "ExampleUsePass" shader fixes the issue
2. Only reproduces if "ExampleUsePass" shader is used by material

Regression introduced in - 2017.1.0a3
Reproducible - 2017.2.0a3, 2017.1.0b9, 2017.1.0a3
Not reproducible - 2017.1.0a2, 5.6.1p3, 5.5.4f1

Fixed in 2017.3