add test

Author: Lilith Hafner

stdlib/REPL/test/replcompletions.jl

@@ -293,6 +293,12 @@ let
     @test isempty(c)
 end
 
+# issue 46800: (3,2).<TAB> errors in the REPL
+let
+    c, r = test_complete("(3,2).")
+    @test isempty(c)
+end
+
 # inexistent completion inside a string
 @test_nocompletion("Base.print(\"lol")