simpler timeout timer close

base/util.jl

@@ -310,12 +310,10 @@ See also `Base.getpass` and `Base.winprompt` for secure entry of passwords.
 """
 function prompt(input::IO, output::IO, message::AbstractString; default::AbstractString="", timeout::Union{Nothing, Real} = nothing)
     timedout = false
-    uinput_entered = false
-    if !isnothing(timeout) && timeout > 0
+    timeout_timer = if !isnothing(timeout) && timeout > 0
         plural = timeout == 1 ? "" : "s"
         msg = !isempty(default) ? "$message [$default] timeout $timeout second$(plural): " : "$message: "
         Timer(timeout) do t
-            uinput_entered && return
             timedout = true
             lock(input.cond)
             input.status = Base.StatusEOF
@@ -324,14 +322,15 @@ function prompt(input::IO, output::IO, message::AbstractString; default::Abstrac
         end
     else
         msg = !isempty(default) ? "$message [$default]: " : "$message: "
+        nothing
     end
     print(output, msg)
     uinput = readline(input, keep=true)
     if timedout
         println(output, "timed out")
         return default
     else
-        uinput_entered = true # disable timeout action
+        isnothing(timeout_timer) || close(timeout_timer)
     end
     isempty(uinput) && return nothing  # Encountered an EOF
     uinput = chomp(uinput)