REPLCompletions: allow completions for import Mod.xxx (#54691)

Author: aviatesk

stdlib/REPL/src/REPLCompletions.jl

@@ -1132,6 +1132,10 @@ function complete_identifiers!(suggestions::Vector{Completion},
             end
             isexpr(ex, :incomplete) && (ex = nothing)
         elseif isexpr(ex, (:using, :import))
+            if isexpr(ex, :import)
+                # allow completion for `import Mod.name` (where `name` is not a module)
+                complete_modules_only = false
+            end
             arglast = ex.args[end] # focus on completion to the last argument
             if isexpr(arglast, :.)
                 # We come here for cases like:

stdlib/REPL/test/replcompletions.jl

@@ -2308,3 +2308,18 @@ let s = "TestImplicitUsing.@asse"
     @test res
     @test "@assert" in c
 end
+
+# JuliaLang/julia#23374: completion for `import Mod.name`
+module Issue23374
+global v23374 = nothing
+end
+let s = "import .Issue23374.v"
+    c, r, res = test_complete_context(s)
+    @test res
+    @test "v23374" in c
+end
+let s = "using .Issue23374.v"
+    c, r, res = test_complete_context(s)
+    @test res
+    @test isempty(c)
+end