actually, this might be nicer as a macro

src/PortAudio.jl

@@ -95,10 +95,8 @@ mutable struct PortAudioStream{T}
         # finalizer(close, this)
         this.sink = PortAudioSink{T}(outdev.name, this, outchans)
         this.source = PortAudioSource{T}(indev.name, this, inchans)
-        this.stream = suppress_err() do
-            Pa_OpenStream(inparams, outparams, sr, 0, paNoFlag,
+        this.stream = @stderr_as_debug Pa_OpenStream(inparams, outparams, sr, 0, paNoFlag,
                           nothing, nothing)
-        end
 
         Pa_StartStream(this.stream)
         # pre-fill the output stream so we're less likely to underrun
@@ -369,9 +367,11 @@ function discard_input(source::PortAudioSource)
     end
 end
 
-function suppress_err(dofunc::Function)
-    debug_message = @suppress_err dofunc()
+macro stderr_as_debug(expression)
+    quote
+        debug_message = @capture_err $(esc(expression))
         @debug debug_message
+    end
 end
 
 function __init__()
@@ -407,9 +407,7 @@ function __init__()
     # junk to STDOUT on initialization, so we swallow it.
     # TODO: actually check the junk to make sure there's nothing in there we
     # don't expect
-    suppress_err() do
-        Pa_Initialize()
-    end
+    @stderr_as_debug Pa_Initialize()
 
     atexit() do
         Pa_Terminate()