$i limit time -milliseconds 0
    lappend result 1. [catch {$i eval {vwait x}} msg] $msg

    # no limit in between:
    $i limit time -seconds {} -milliseconds {}
    lappend result 2. [catch {$i eval {vwait 0 x}} msg] $msg

    # limit should be exceeded: (wait infinite by -1)
    # limit should be exceeded: (wait infinite)
    $i limit time -milliseconds 0
    lappend result 3. [catch {$i eval {vwait -1 x}} msg] $msg
    lappend result 3. [catch {$i eval {vwait x}} msg] $msg
    # limit should be exceeded (wait too long - 1000ms):
    $i limit time -milliseconds 0
    lappend result 4. [catch {$i eval {vwait 1000 x}} msg] $msg

    set tout [clock seconds]; incr tout 10
    # wait timeout (before limit):
    $i limit time -seconds $tout

    after 50 {lappend x 2}
    after 250 {lappend x 3}
    after 1000 {lappend x "error-too-slow"}
    vwait 0 x; # no-wait
    lappend z $x; # 0 {} - (x still empty)
    vwait 200 x; # wait up-to 200ms
    lappend z $x; # 0 {} {1 2}
    vwait -1 x; # infinite wait
    vwait x; # infinite wait
    lappend z $x; # 0 {} {1 2} {1 2 3}
    foreach i [after info] {
	after cancel $i
    }
    set z
} {0 {} {1 2} {1 2 3}}