[REPL] Fix typo in using/import completion (JuliaLang#53273)

Co-authored-by: Keno Fischer <[email protected]>

Author: Keno

stdlib/REPL/src/REPLCompletions.jl

@@ -1136,7 +1136,7 @@ function complete_identifiers!(suggestions::Vector{Completion}, @nospecialize(ff
                         if ex === nothing
                             ex = arg
                         else
-                            ex = Expr(:., out, QuoteNode(arg))
+                            ex = Expr(:., ex, QuoteNode(arg))
                         end
                     else # invalid expression
                         ex = nothing

stdlib/REPL/test/replcompletions.jl

@@ -2232,6 +2232,11 @@ let s = "using .Issue52922.Inn"
     @test res
     @test "Inner1" in c
 end
+let s = "using .Issue52922.Inner1."
+    c, r, res = test_complete_context(s)
+    @test res
+    @test "Inner12" in c
+end
 let s = "using .Inner1.Inn"
     c, r, res = test_complete_context(s, Issue52922)
     @test res