Replace lets by definitions in test example

3 jobs for master in 6 minutes and 40 seconds (queued for 29 seconds)
Name Stage Failure
failed
coq:dev Build
make[2]: *** Waiting for unfinished jobs....
CoqMakefile:654: recipe for target 'src/LocalBlockchain.vo' failed
make[2]: *** [src/LocalBlockchain.vo] Error 1
CoqMakefile:319: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/builds/jakobbotsch/smart-contracts'
Makefile:7: recipe for target 'all' failed
make: *** [all] Error 2
ERROR: Job failed: exit code 1