Make debugging macros insert branches on DEBUG_LEVEL (#356)

Co-authored-by: Jacob Quinn <quinn.jacobd@gmail.com>

Author: ararslan

src/debug.jl

@@ -3,8 +3,11 @@ taskid(t=current_task()) = string(hash(t) & 0xffff, base=16, pad=4)
 debug_header() = string("DEBUG: ", rpad(Dates.now(), 24), taskid(), " ")
 
 macro debug(n::Int, s)
-    DEBUG_LEVEL[] >= n ? :(println(debug_header(), $(esc(s)))) :
-                         :()
+    quote
+        if DEBUG_LEVEL[] >= $n
+            println(debug_header(), $(esc(s)))
+        end
+    end
 end
 
 sprintcompact(x) = sprint(show, x; context=:compact => true)