diff --git a/chan.go b/chan.go
deleted file mode 100644
index e2f093c..0000000
--- a/chan.go
+++ /dev/null
@@ -1,122 +0,0 @@
-package gui
-
-// channel communication to the plugins
-// https://github.com/sourcegraph/conc
-// https://www.reddit.com/r/golang/comments/11x1oek/hello_gophers_show_me_your_concurrent_code/
-
-import (
-	// "regexp"
-	// "go.wit.com/gui/toolkit"
-	"sync"
-	"runtime"
-	"github.com/sourcegraph/conc"
-	"github.com/sourcegraph/conc/stream"
-	"github.com/sourcegraph/conc/panics"
-)
-
-// this should never exit
-// TODO: clean up all this poorly named code
-func makeConc() {
-	var wg conc.WaitGroup
-	defer wg.Wait()
-
-	startTheThing(&wg)
-	log(debugError, "panic?")
-	sleep(2)
-	log(debugError, "panic? after sleep(5)")
-}
-
-func startTheThing(wg *conc.WaitGroup) {
-	f := func() {
-		log(debugError, "startTheThing() == about to panic now")
-		panic("test conc.WaitGroup")
-	}
-	wg.Go(func() {
-		ExampleCatcher(f)
-	})
-}
-
-func ExampleCatcher(f func()) {
-	var pc panics.Catcher
-	i := 0
-	pc.Try(func() { i += 1 })
-	pc.Try(f)
-	pc.Try(func() { i += 1 })
-
-	recovered := pc.Recovered()
-
-	log(debugError, "panic.Recovered():", recovered.Value.(string))
-	frames := runtime.CallersFrames(recovered.Callers)
-	for {
-		frame, more := frames.Next()
-		log(debugError, "\t", frame.Function)
-
-		if !more {
-			break
-		}
-	}
-}
-
-func mapStream(
-    in chan int,
-    out chan int,
-    f func(int) int,
-) {
-    tasks := make(chan func())
-    taskResults := make(chan chan int)
-
-    // Worker goroutines
-    var workerWg sync.WaitGroup
-    for i := 0; i < 10; i++ {
-        workerWg.Add(1)
-        go func() {
-            defer workerWg.Done()
-            for task := range tasks {
-                task()
-            }
-        }()
-    }
-
-    // Ordered reader goroutines
-    var readerWg sync.WaitGroup
-    readerWg.Add(1)
-    go func() {
-        defer readerWg.Done()
-        for result := range taskResults {
-            item := <-result
-            out <- item
-        }
-    }()
-
-    // Feed the workers with tasks
-    for elem := range in {
-        resultCh := make(chan int, 1)
-        taskResults <- resultCh
-        tasks <- func() {
-            resultCh <- f(elem)
-        }
-    }
-
-    // We've exhausted input.
-    // Wait for everything to finish
-    close(tasks)
-    workerWg.Wait()
-    close(taskResults)
-    readerWg.Wait()
-}
-
-func mapStream2(
-    in chan int,
-    out chan int,
-    f func(int) int,
-) {
-    s := stream.New().WithMaxGoroutines(10)
-    for elem := range in {
-        elem := elem
-        s.Go(func() stream.Callback {
-            res := f(elem)
-            return func() { out <- res }
-        })
-    }
-    s.Wait()
-}