add test for module name conflict

Author: vchuravy

test/compile.jl

@@ -411,6 +411,39 @@ let dir = mktempdir(),
     end
 end
 
+# test loading a package with conflicting namespace
+let dir = mktempdir()
+  Test_module = :Test6c92f26
+  try
+      write(joinpath(dir, "Iterators.jl"),
+            """
+            module Iterators
+                 __precompile__(true)
+            end
+            """)
+
+      write(joinpath(dir, "$Test_module.jl"),
+            """
+            module $Test_module
+                 __precompile__(true)
+                 using Iterators
+            end
+            """)
+
+      testcode = """
+          insert!(LOAD_PATH, 1, $(repr(dir)))
+          insert!(Base.LOAD_CACHE_PATH, 1, $(repr(dir)))
+          using $Test_module
+      """
+
+      exename = `$(Base.julia_cmd()) --startup-file=no`
+      @test readchomp(`$exename -E $(testcode)`) == "nothing"
+      @test readchomp(`$exename -E $(testcode)`) == "nothing"
+  finally
+      rm(dir, recursive=true)
+  end
+end
+
 let module_name = string("a",randstring())
     insert!(LOAD_PATH, 1, pwd())
     file_name = string(module_name, ".jl")