repl: Also ignore local imports with specified symbols (#54982)

Otherwise it's trying to find the `.` package, which obviously doesn't
exist. This isn't really a problem - it just does some extra processing
and loads Pkg, but let's make this correct anyway.

stdlib/REPL/src/REPL.jl

@@ -285,11 +285,14 @@ function _modules_to_be_loaded!(ast::Expr, mods::Vector{Symbol})
             arg = arg::Expr
             arg1 = first(arg.args)
             if arg1 isa Symbol # i.e. `Foo`
-                if arg1 != :. # don't include local imports
+                if arg1 != :. # don't include local import `import .Foo`
                     push!(mods, arg1)
                 end
             else # i.e. `Foo: bar`
-                push!(mods, first((arg1::Expr).args))
+                sym = first((arg1::Expr).args)::Symbol
+                if sym != :. # don't include local import `import .Foo: a`
+                    push!(mods, sym)
+                end
             end
         end
     end

stdlib/REPL/test/repl.jl

@@ -1478,6 +1478,11 @@ end
         @test isempty(mods)
         mods = REPL.modules_to_be_loaded(Base.parse_input_line("begin using Foo; Core.eval(Main,\"using Foo\") end"))
         @test mods == [:Foo]
+
+        mods = REPL.modules_to_be_loaded(:(import .Foo: a))
+        @test isempty(mods)
+        mods = REPL.modules_to_be_loaded(:(using .Foo: a))
+        @test isempty(mods)
     end
 end