Refactor PowExp to error about unimplemented ^^ in the backend.
Add a trait to indicate if a function is override.
Add unit test for traits isOverrideFunction.
fix issue 10694 - wrong purity check for static variables with impure
destructor
Merge pull request #2366 from jacob-carlborg/traits_isOverrideFunction

Add a trait to indicate if a function is override
Merge pull request #2358 from ibuclaw/powexp

Refactor PowExp to error about unimplemented ^^ in the backend.
fix Issue 10676 - excessive compilation times with optimized PIC build
Merge pull request #2375 from WalterBright/fix10676

fix Issue 10676 - excessive compilation times with optimized PIC build
Merge pull request #2373 from hpohl/10694

fix issue 10694 - wrong purity check for static variables with impure destructor