The following step can take a long time, please be patient.
/Users/ec/.rakudobrew/moar-HEAD/install/bin/moar --libpath="/Users/ec/.rakudobrew/moar-HEAD/install/languages/nqp/lib" perl6.moarvm --setting=NULL --ll-exception --optimize=3 --target=mbc --stagestats --output=CORE.setting.moarvm src/gen/m-CORE.setting
Stage start      :   0.000
Stage parse      : moar(49383,0x7fff7e131310) malloc: *** error for object 0x7fbf8e6e6ae0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
make: *** [CORE.setting.moarvm] Abort trap: 6
Failed running make install at /Users/ec/.rakudobrew/bin/rakudobrew line 23.