How to reproduce:
1. Create a new project
2. Create a new Shader
3. Add lines anywhere in the shader:
/*
//*/
4. Notice, that the shader fails to compile

Actual result: There are errors caused by nested block comment with single-line comment inside.
Expected result: Shader should compile.

Reproducible with: 2018.1.0a7, 2017.3.0f2, 2017.2.1f1, 2017.1.2p4, 5.6.4p4, 5.5.5p2.

Notes:
Compiler errors:
No ENDCG tag found after CGPROGRAM tag
Parse error: syntax error, unexpected TVAL_ID