Is there Visual Studio 2015 Debugging step skipping?

Question

I installed the new version of Visual Studio Community 2015.

Opened old Visual Studio 2010 projects. They compiled okay. Then when I needed to debug them I found out something strange.

When I try to Step Over(F10) just skips lines of code like they weren't there.

For example I start debugging in line 33, then F10 sends me right to line 43.

How is that?

And is it configurable.

Answer 1

This behavior is consistent with debugging optimized code.

You can verify what code was generated by going to Tools -> ILDasm, loading your executable and inspecting that function. Or, while on a breakpoint in the Debugger, Debug -> Windows -> Disassembly (or click Alt+8).

This may be a new feature in 2015, as my 2013 does not optimize that assignment/test out...