Read the source for the compiler and find all the differences. There are constantly minor semantic changes, like numeric conversions, double parsing, scope of generated temps in for loops, delegate conversions, Nothing, etc.
I just started typing this list off the top of my head and every time I typed something out I could think of one more thing. And these are just the ones I remember, so they're probably the ones that were annoying to work around in the compiler.
I just started typing this list off the top of my head and every time I typed something out I could think of one more thing. And these are just the ones I remember, so they're probably the ones that were annoying to work around in the compiler.