A working code now outputs an error:

flushing to eeprom...
WARNING: If specifying an object, it must be of the form {data : ..., count : N}
WARNING: If specifying an object, it must be of the form {data : ..., count : N}
Uncaught Error: Function "set" not found!
 at line 1 col 123
...int8Array(r.length+3&-4);a.set(r),r=a}return r.length&&this....
                              ^
in function "_write" called from line 1 col 289
...ory!";this._write(r.end,t,e)}
                              ^
in function "write" called from line 1 col 96
...f.write(this.fileNo,pack(t)),this.ram=t
                              ^
in function "write" called from line 1 col 57
console.log("flushing to eeprom..."),this.write(this.ram)
                                                        ^
in function "flush" called from line 1 col 515
...atus: ",cfg.ram),cfg.flush()
                              ^
in function "logFileInit" called from line 1 col 13
logFileInit(),limitFilter(),setupIo(),sleep(1e3,function(){r...
            ^
in function called from system

I built Espruino by myself from commit 3d4047bf4fe5ab52f7b583257e41eae24a7fc947.

EDIT

Situation is the same with git checkout tags/RELEASE_1V85