This should work then:
using Dates
input_prompt() = "julia-" * string(Dates.now()) * ">"
try
using OhMyREPL
catch e
@warn e
end
atreplinit() do repl
isdefined(@__MODULE__(), :OhMyREPL) ? OhMyREPL.input_prompt!(input_prompt) : nothing
end
e.g. just separating the try into it’s own block.