Merge branch 'master' into 'master'

[feature]: remember last result as `ans`

See merge request redox-os/calc!24
1 job for master in 3 minutes and 27 seconds (queued for 1 second)
Status Name Job ID Coverage
failed nightly #22347


Name Stage Failure
nightly Test
   |                                                                      -- borrow later used here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0503`.
error: could not compile `liner`.
warning: build failed, waiting for other jobs to finish...
error: build failed
ERROR: Job failed: exit code 1