diff --git a/Project.toml b/Project.toml
index d16723f2..a0fe19a8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -28,7 +28,6 @@ Profile = "9abbd945-dff8-562f-b5e8-e1ebf5ef1b79"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
-Traceur = "37b6cedf-1f77-55f8-9503-c64b63398394"
 TreeViews = "a2a6695c-b41b-5b7d-aed9-dbfdeacea5d7"
 WebIO = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"
 WebSockets = "104b5d7c-a370-577a-8038-80a2059c5097"
@@ -60,6 +59,7 @@ julia = "0.7, 1"
 [extras]
 Example = "7876af07-990d-54b4-ab0e-23690620f79a"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Traceur = "37b6cedf-1f77-55f8-9503-c64b63398394"
 
 [targets]
 test = ["Example", "Test"]
diff --git a/src/Atom.jl b/src/Atom.jl
index 9bacdcce..4ec4e67b 100644
--- a/src/Atom.jl
+++ b/src/Atom.jl
@@ -4,8 +4,7 @@ __precompile__()
 module Atom
 
 using Base.StackTraces, InteractiveUtils, Logging
-using Juno, Lazy, JSON, MacroTools, Media
-import Requires
+using Juno, Lazy, JSON, MacroTools, Media, Requires
 import Media: @dynamic
 
 function __init__()
@@ -38,9 +37,8 @@ function __init__()
     nothing
   end
 
-  Requires.@require WebIO="0f1e0344-ec1d-5b48-a673-e5cf874b6c29" begin
-    include("display/webio.jl")
-  end
+  @require WebIO="0f1e0344-ec1d-5b48-a673-e5cf874b6c29" include("display/webio.jl")
+  @require Traceur="37b6cedf-1f77-55f8-9503-c64b63398394" include("profiler/traceur.jl")
 end
 
 # basics
@@ -64,7 +62,6 @@ include("formatter.jl")
 include("frontend.jl")
 include("debugger/debugger.jl")
 include("profiler/profiler.jl")
-include("profiler/traceur.jl")
 
 include("precompile.jl")
 _precompile_()
diff --git a/src/profiler/traceur.jl b/src/profiler/traceur.jl
index 7aa69c55..83cf9bd7 100644
--- a/src/profiler/traceur.jl
+++ b/src/profiler/traceur.jl
@@ -1,4 +1,4 @@
-import Traceur
+import .Traceur
 
 function trace(ex, args...)
     :($(showtrace)($(gettrace)(() -> $(esc(ex)); $(map(esc, args)...))))
diff --git a/test/modules.jl b/test/modules.jl
index 3cad485e..a477be0d 100644
--- a/test/modules.jl
+++ b/test/modules.jl
@@ -24,12 +24,17 @@
         if use_compiled_modules()
             # works for precompiled packages
             let (parentfile, included_files) = modulefiles(Atom)
-                expected = Set(atommodfiles)
-                actual = Set((parentfile, included_files...))
-                @test actual == expected
+                for f in included_files
+                    @test f in atommodfiles
+                end
+                # NOTE: `+ 1` stands for Atom.jl (`parentfile`)
+                @test length(included_files) + 1 === length(atommodfiles)
 
-                # can't detect display/webio.jl
-                @test_broken webiofile in modfiles
+                # TODO:
+                # Revise-like module traverse fails to detect lazily loaded files even if
+                # they are actually loaded.
+                @test_broken webiofile in included_files
+                @test_broken traceurfile in included_files
             end
 
             # fails for non-precompiled packages
@@ -41,17 +46,16 @@
         ## CSTPraser-based module file detection
         # basic
         let included_files = normpath.(modulefiles("Atom", atomjlfile))
-            # finds all the files in Atom module except display/webio.jl
-            for f in atommodfiles
-                f == webiofile && continue
-                @test f in included_files
+            for f in included_files
+                @test f in atommodfiles
             end
+            @test length(included_files) === length(atommodfiles)
 
-            # only finds files in a module -- exclude files in the submodules
-            @test length(atommodfiles) == length(included_files)
-
-            # can't look for non-toplevel `include` calls
+            # TODO:
+            # CSTParser-based module traverse is currently not able to find non-toplevel
+            # `include` calls
             @test_broken webiofile in included_files
+            @test_broken traceurfile in included_files
         end
 
         # safety checks for recursive `include`s
diff --git a/test/runtests.jl b/test/runtests.jl
index 8ce27151..be6aa87d 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -7,8 +7,12 @@ atomjldir = joinpath′(@__DIR__, "..")
 atomsrcdir = joinpath′(atomjldir, "src")
 atomjlfile = joinpath′(atomsrcdir, "Atom.jl")
 webiofile = joinpath′(atomsrcdir, "display", "webio.jl")
+traceurfile = joinpath′(atomsrcdir, "profiler", "traceur.jl")
 
-# files in `Atom` module (except files in its submodules)
+# files in `Atom` module except files in submodules
+# TODO:
+# currently both Revise-like and CSTPraser-based module traverse fails
+# to detect lazily loaded files even if they are actually loaded.
 atommodfiles = let
     files = []
     debuggerdir = joinpath′(atomsrcdir, "debugger")
@@ -23,15 +27,12 @@ atommodfiles = let
         end
         if d == profilerdir
             push!(files, joinpath′(d, "profiler.jl"))
-            push!(files, joinpath′(d, "traceur.jl"))
+            # push!(files, joinpath′(d, "traceur.jl"))
             continue
         end
 
         for f in fs
-            # NOTE: currently both Revise-like and CSTPraser-based approach fails
-            # to detect display/webio.jl as a file in Atom module
             f == "webio.jl" && continue
-
             # .jl check is needed for travis, who creates hoge.cov files
             endswith(f, ".jl") && push!(files, joinpath′(d, f))
         end