https://github.com/anutosh491 created 
https://github.com/llvm/llvm-project/pull/154339

Addressing 
https://github.com/llvm/llvm-project/pull/153560?notification_referrer_id=NT_kwDOBTBQx7QxODIyMDYwOTQ1ODo4NzA1MjQ4Nw#issuecomment-3199157830

The test runs as expected now 
```
anutosh491@Anutoshs-MacBook-Air lldb % ./bin/lldb-dotest -p TestClangREPL.py

/opt/homebrew/opt/python@3.13/bin/python3.13 
/Users/anutosh491/work/llvm-project/lldb/test/API/dotest.py --arch arm64 -u 
CXXFLAGS -u CFLAGS --out-of-tree-debugserver --build-dir 
/Users/anutosh491/build/lldb/lldb-test-build.noindex --executable 
/Users/anutosh491/build/lldb/./bin/lldb --compiler 
/Users/anutosh491/build/lldb/./bin/clang --dsymutil 
/Users/anutosh491/build/lldb/./bin/dsymutil --make /usr/bin/make 
--lldb-libs-dir /Users/anutosh491/build/lldb/./lib --llvm-tools-dir 
/Users/anutosh491/build/lldb/./bin --libcxx-include-dir 
/Users/anutosh491/build/lldb/include/c++/v1 --libcxx-library-dir 
/Users/anutosh491/build/lldb/lib --lldb-obj-root 
/Users/anutosh491/build/lldb/tools/lldb --cmake-build-type Release -p 
TestClangREPL.py
lldb version 22.0.0git (g...@github.com:anutosh491/llvm-project.git revision 
ab8b4f6629ee9c4c99c2751aa394f65ee2a4a34a)
  clang revision ab8b4f6629ee9c4c99c2751aa394f65ee2a4a34a
  llvm revision ab8b4f6629ee9c4c99c2751aa394f65ee2a4a34a
Skipping the following test categories: ['libstdcxx', 'msvcstl', 'dwo', 'llgs', 
'fork']
PASS: LLDB (/Users/anutosh491/build/lldb/bin/clang-arm64) :: 
test_basic_completion (TestClangREPL.TestCase.test_basic_completion)
PASS: LLDB (/Users/anutosh491/build/lldb/bin/clang-arm64) :: 
test_completion_with_space_only_line 
(TestClangREPL.TestCase.test_completion_with_space_only_line)
----------------------------------------------------------------------
Ran 2 tests in 75.587s

OK
```

>From 009f13dae8f41a28beb59f2c75692a962886d708 Mon Sep 17 00:00:00 2001
From: anutosh491 <andersonbhat...@gmail.com>
Date: Tue, 19 Aug 2025 19:25:33 +0530
Subject: [PATCH] Fix failing test in TestClangREPL

---
 lldb/test/API/repl/clang/TestClangREPL.py | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/lldb/test/API/repl/clang/TestClangREPL.py 
b/lldb/test/API/repl/clang/TestClangREPL.py
index 3152018865b1e..ffa598b650937 100644
--- a/lldb/test/API/repl/clang/TestClangREPL.py
+++ b/lldb/test/API/repl/clang/TestClangREPL.py
@@ -30,8 +30,9 @@ def start_repl(self):
         self.expect("b main", substrs=["Breakpoint 1", "address ="])
         self.expect("run", substrs=["stop reason = breakpoint 1"])
 
-        # Start the REPL.
-        self.child.send("expression --repl -l c --\n")
+        # Start the REPL with a harmless trailing input to trigger the warning.
+        self.child.send("expression --repl -l c -- 3 + 3\n")
+        self.child.expect_exact("Warning: trailing input is ignored in --repl 
mode")
         self.child.expect_exact("1>")
 
     # PExpect uses many timeouts internally and doesn't play well
@@ -56,16 +57,6 @@ def test_basic_completion(self):
 
         self.quit()
 
-        # Re-enter the REPL with trailing input to trigger warning.
-        self.child.send("expression --repl -l c -- 3 + 3\n")
-        self.child.expect_exact("Warning: trailing input is ignored in --repl 
mode\n")
-        self.child.expect_exact("1>")
-
-        # Evaluate another expression after warning.
-        self.expect_repl("4 + 4", substrs=["(int) $3 = 8"])
-
-        self.quit()
-
     # PExpect uses many timeouts internally and doesn't play well
     # under ASAN on a loaded machine..
     @skipIfAsan

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