revert error msg in SystemError

Author: fatteneder

base/loading.jl

@@ -2059,9 +2059,9 @@ function _include_dependency(mod::Module, _path::AbstractString; track_content=t
     end
     if !_track_dependencies[]
         if !path_may_be_dir && !isfile(path)
-            throw(SystemError("including file $(repr(path))", Libc.ENOENT))
+            throw(SystemError("opening file $(repr(path))", Libc.ENOENT))
         elseif path_may_be_dir && !Filesystem.isreadable(path)
-            throw(SystemError("including file or folder $(repr(path))", Libc.ENOENT))
+            throw(SystemError("opening file or folder $(repr(path))", Libc.ENOENT))
         end
     else
         @lock require_lock begin

test/loading.jl

@@ -652,7 +652,7 @@ end
     exc = try; include("./notarealfile.jl"); "unexpectedly reached!"; catch exc; exc; end
     @test exc isa SystemError
     exc.prefix
-end == "including file $(repr(joinpath(@__DIR__, "notarealfile.jl")))"
+end == "opening file $(repr(joinpath(@__DIR__, "notarealfile.jl")))"
 
 old_act_proj = Base.ACTIVE_PROJECT[]
 pushfirst!(LOAD_PATH, "@")
@@ -1549,7 +1549,7 @@ end
         end
 
         file = joinpath(depot, "dev", "non-existent.jl")
-        @test_throws SystemError("including file $(repr(file))") include(file)
+        @test_throws SystemError("opening file $(repr(file))") include(file)
         touch(file)
         @test include_dependency(file) === nothing
         chmod(file, 0x000)
@@ -1559,7 +1559,7 @@ end
             @test include_dependency(dir) === nothing
             dir
         end
-        @test_throws SystemError("including file or folder $(repr(dir))") include_dependency(dir)
+        @test_throws SystemError("opening file or folder $(repr(dir))") include_dependency(dir)
     end
 end