From 85a1a575f9909bbfa84268a9744f22ca0f0a1593 Mon Sep 17 00:00:00 2001
From: romes <rodrigo.m.mesquita@gmail.com>
Date: Mon, 13 Feb 2023 11:43:37 +0000
Subject: fix: Mark ghci Prelude import as implicit

Fixes #22829

In GHCi, we were creating an import declaration for Prelude but we were
not setting it as an implicit declaration. Therefore, ghci's import of
Prelude triggered -Wmissing-import-lists.

Adds regression test T22829 to testsuite
---
 ghc/GHCi/UI.hs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'ghc')

diff --git a/ghc/GHCi/UI.hs b/ghc/GHCi/UI.hs
index 418502f306..58c446fb43 100644
--- a/ghc/GHCi/UI.hs
+++ b/ghc/GHCi/UI.hs
@@ -556,7 +556,10 @@ interactiveUI config srcs maybe_exprs = do
 
    default_editor <- liftIO $ findEditor
    eval_wrapper <- mkEvalWrapper default_progname default_args
-   let prelude_import = simpleImportDecl preludeModuleName
+   let prelude_import =
+         case simpleImportDecl preludeModuleName of
+           -- Set to True because Prelude is implicitly imported.
+           impDecl@ImportDecl{ideclExt=ext} -> impDecl{ideclExt = ext{ideclImplicit=True}}
    hsc_env <- GHC.getSession
    let in_multi = length (hsc_all_home_unit_ids hsc_env) > 1
    empty_cache <- liftIO newIfaceCache
-- 
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