repl: make last error available as `_error`
This is pretty useful when trying to inspect the last
error caught by a REPL, and is made to be analogous to _
,
which contains the last successful completion value.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
repl