Fix #6170 Move nextPrompt after replCommand

Author: mpilgrem

test/integration/lib/StackTest.hs

@@ -206,7 +206,7 @@ runRepl cmd args actions = do
       catch
         (hGetChar rStderr >>= hPutChar logFileHandle)
         (\e -> unless (isEOFError e) $ throw e)
-  runReaderT (nextPrompt >> actions) (ReplConnection rStdin rStdout)
+  runReaderT actions (ReplConnection rStdin rStdout)
   waitForProcess ph
 
 repl :: HasCallStack => [String] -> Repl () -> IO ()

test/integration/tests/3926-ghci-with-sublibraries/Main.hs

@@ -15,7 +15,11 @@ main = do
 
 replThread :: IO ()
 replThread = repl [] $ do
+  -- The command must be issued before searching the output for the next prompt,
+  -- otherwise, on Windows from msys2-20230526, `stack repl` encounters a EOF
+  -- and terminates gracefully.
   replCommand ":main"
+  nextPrompt
   line <- replGetLine
   let expected = "hello world"
   when (line /= expected) $

test/integration/tests/4270-files-order/Main.hs

@@ -3,13 +3,17 @@ import StackTest
 
 main :: IO ()
 main = do
-    stack ["build"]
-    repl [] $ do
-        replCommand "putStrLn greeting"
-        line <- replGetLine
-        let expected = "Hello, world!"
-        when (line /= expected) $
-          error $
-               "Didn't load correctly.\n"
-            <> "Expected: " <> expected <> "\n"
-            <> "Actual  : " <> line <> "\n"
+  stack ["build"]
+  repl [] $ do
+    -- The command must be issued before searching the output for the next
+    -- prompt, otherwise, on Windows from msys2-20230526, `stack repl`
+    -- encounters a EOF and terminates gracefully.
+    replCommand "putStrLn greeting"
+    nextPrompt
+    line <- replGetLine
+    let expected = "Hello, world!"
+    when (line /= expected) $
+      error $
+           "Didn't load correctly.\n"
+        <> "Expected: " <> expected <> "\n"
+        <> "Actual  : " <> line <> "\n"

test/integration/tests/module-added-multiple-times/Main.hs

@@ -4,11 +4,15 @@ import StackTest
 
 main :: IO ()
 main = repl [] $ do
-    replCommand ":main"
-    line <- replGetLine
-    let expected = "Hello World!"
-    when (line /= expected) $
-      error $
-           "Main module didn't load correctly.\n"
-        <> "Expected: " <> expected <> "\n"
-        <> "Actual  : " <> line <> "\n"
+  -- The command must be issued before searching the output for the next prompt,
+  -- otherwise, on Windows from msys2-20230526, `stack repl` encounters a EOF
+  -- and terminates gracefully.
+  replCommand ":main"
+  nextPrompt
+  line <- replGetLine
+  let expected = "Hello World!"
+  when (line /= expected) $
+    error $
+         "Main module didn't load correctly.\n"
+      <> "Expected: " <> expected <> "\n"
+      <> "Actual  : " <> line <> "\n"