Add a test for local variables inside of for loops inside of async functions.

rdar://105186946

Author: adrian-prantl

lldb/test/API/lang/swift/async/variables/Makefile

@@ -0,0 +1,3 @@
+SWIFT_SOURCES := main.swift
+SWIFTFLAGS_EXTRAS := -parse-as-library
+include Makefile.rules

lldb/test/API/lang/swift/async/variables/TestSwiftAsyncVariables.py

@@ -0,0 +1,23 @@
+import lldb
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbtest as lldbtest
+import lldbsuite.test.lldbutil as lldbutil
+import unittest2
+
+
+class TestSwiftAsyncVariables(lldbtest.TestBase):
+
+    mydir = lldbtest.TestBase.compute_mydir(__file__)
+
+    @swiftTest
+    @skipIf(oslist=['windows', 'linux'])
+    def test(self):
+        """Test local variables in async functions"""
+        self.build()
+        src = lldb.SBFileSpec('main.swift')
+        target, process, thread, bkpt = lldbutil.run_to_source_breakpoint(
+            self, 'break here', src)
+
+        while process.selected_thread.stop_reason == lldb.eStopReasonBreakpoint:
+            self.expect("frame variable x", substrs=["23"])
+            process.Continue()

lldb/test/API/lang/swift/async/variables/main.swift

@@ -0,0 +1,23 @@
+import Swift
+func use<T>(_ t: T) {}
+func sink<T>(_ t: T) {}
+
+func split() async {}
+
+func f(_ xs: [Int?]) async {
+  for x in xs {
+    let x = x!
+    sink(x) // break here
+  }
+  await split()
+  for x in xs {
+    let x = x!
+    sink(x) // break here
+  }
+}
+
+@main struct Main {
+  static func main() async {
+    await f([23])
+  }
+}