Issue 1:
julia> @Base.syn┌ Error: Error in the keymap
│ exception =
│ LoadError: UndefVarError: @Base not defined
│ Stacktrace:
│ [1] top-level scope
│ [2] lower at ./meta.jl:123 [inlined]
│ [3] get_type(::Expr, ::Module) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPLCompletions.jl:421
│ [4] complete_symbol(::String, ::REPL.REPLCompletions.var"#21#25", ::Module) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPLCompletions.jl:122
│ [5] completions(::String, ::Int64, ::Module) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPLCompletions.jl:703
│ [6] completions(::String, ::Int64) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPLCompletions.jl:573
│ [7] complete_line(::REPL.REPLCompletionProvider, ::Any) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:372
│ [8] complete_line(::REPL.LineEdit.PromptState, ::Any) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:329
│ [9] complete_line(::REPL.LineEdit.MIState) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:320
│ [10] edit_tab(::REPL.LineEdit.MIState, ::Any, ::Any) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2032 (repeats 2 times)
│ [11] (::REPL.LineEdit.var"#109#162")(::Any, ::Any, ::Vararg{Any,N} where N) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2073
│ [12] #invokelatest#1 at ./essentials.jl:712 [inlined]
│ [13] invokelatest at ./essentials.jl:711 [inlined]
│ [14] (::REPL.LineEdit.var"#22#23"{REPL.LineEdit.var"#109#162",String})(::Any, ::Any) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:1364
│ [15] prompt!(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2446
│ [16] run_interface(::REPL.Terminals.TextTerminal, ::REPL.LineEdit.ModalInterface, ::REPL.LineEdit.MIState) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2349
│ [17] run_frontend(::REPL.LineEditREPL, ::REPL.REPLBackendRef) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:1055
│ [18] run_repl(::REPL.AbstractREPL, ::Any) at /home/keno/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:206
│ [19] (::Base.var"#766#768"{Bool,Bool,Bool,Bool})(::Module) at ./client.jl:383
│ [20] #invokelatest#1 at ./essentials.jl:712 [inlined]
│ [21] invokelatest at ./essentials.jl:711 [inlined]
│ [22] run_main_repl(::Bool, ::Bool, ::Bool, ::Bool, ::Bool) at ./client.jl:367
│ [23] exec_options(::Base.JLOptions) at ./client.jl:305
│ [24] _start() at ./client.jl:484
│ in expression starting at none:1
└ @ REPL.LineEdit ~/julia/usr/share/julia/stdlib/v1.4/REPL/src/LineEdit.jl:2448

Issue 2:
Open julia with REPL, type @nonexist. and hit Tab:

_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: https://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.7.0-DEV.5138 (2018-05-19 22:52 UTC)
_/ |\__'_|_|_|\__'_| | Commit a465d33f6 (1 day old master)
|__/ | x86_64-redhat-linux

julia> @nonexist.┌ Error: Error in the keymap
│ exception =
│ LoadError: UndefVarError: @nonexist not defined
│ Stacktrace:
│ [1] top-level scope
│ [2] lower at ./meta.jl:68 [inlined]
│ [3] get_type(::Expr, ::Module) at /TEST/usr/share/julia/stdlib/v0.7/REPL/src/REPLCompletions.jl:362
│ [4] complete_symbol(::String, ::getfield(REPL.REPLCompletions, Symbol("##15#17"))) at /TEST/usr/share/julia/stdlib/v0.7/REPL/src/REPLCompletions.jl:63
│ [5] completions(::String, ::Int64) at /TEST/usr/share/julia/stdlib/v0.7/REPL/src/REPLCompletions.jl:648
...