How to reproduce:
1. Open the attached project
2. Observe the Test.cs compile error CS1525: Unexpected symbol '<'
3. See Test.cs:8--9 lines
int a = 42;
Debug.LogFormat("{0} {1}", 1 < a, a > 1);

One can workaround the problem by putting one parameter into parenthesis like this:
int a = 42;
Debug.LogFormat("{0} {1}", (1 < a), a > 1);