If I understand the documentation correctly, this should not compile:
#line 99L
This is because the fist token following line is supposed to be an Integer, not an IntegerLiteral. Thus the suffix "L" should not be allowed. However, this compiles on both D1 and D2.
The suffix here is silly but harmless. I don't much care whether it should be allowed. But it is still worth noting that the documentation is inconsistent with the compiler behavior.
Tested on Windows with v1.063, v1.065, v2.049, and v2.050.