[cfe-dev] How to try out -Wlifetime ?

[cen via cfe-dev]

Hi

I watched Herb's talk on Cppcon so I decided to try out the new lifetime 
feature. I cloned llvm and clang master from github mirror and built 
both locally.

I tried to compile the first godbolt sample 
(https://godbolt.org/z/szJjnH) but no luck:

clang -Wlifetime -lstdc++ b.cpp
warning: unknown warning option '-Wlifetime'; did you mean 
'-Wdate-time'? [-Wunknown-warning-option]
1 warning generated.


What am I doing wrong?