Merge pull request #74772 from susmonteiro/susmonteiro/cxx-span-hardening

[cxx-interop] Enable hardening when running tests for std::span

Author: susmonteiro

test/Interop/Cxx/stdlib/use-std-span.swift

@@ -1,4 +1,5 @@
 // RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop -Xcc -std=c++20)
+// RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop -Xcc -std=c++20 -Xcc -D_LIBCPP_ENABLE_HARDENED_MODE)
 
 // FIXME swift-ci linux tests do not support std::span
 // UNSUPPORTED: OS=linux-gnu
@@ -13,6 +14,24 @@ import CxxStdlib
 
 var StdSpanTestSuite = TestSuite("StdSpan")
 
+func takesSpanOfInt(_ s: Span) {
+  expectEqual(s.size(), 3)
+  expectFalse(s.empty())
+
+  expectEqual(s[0], 1)
+  expectEqual(s[1], 2)
+  expectEqual(s[2], 3)
+}
+
+func takesSpanOfString(_ s: SpanOfString) {
+  expectEqual(s.size(), 3)
+  expectFalse(s.empty())
+
+  expectEqual(s[0], "")
+  expectEqual(s[1], "ab")
+  expectEqual(s[2], "abc")
+}
+
 StdSpanTestSuite.test("EmptySpan") {
   let s = Span()
   expectEqual(s.size(), 0)
@@ -43,4 +62,12 @@ StdSpanTestSuite.test("InitStringSpan") {
   expectEqual(sspan[2], "abc")
 }
 
+StdSpanTestSuite.test("SpanOfIntAsParam") {
+  takesSpanOfInt(ispan)
+}
+
+StdSpanTestSuite.test("SpanOfStringAsParam") {
+  takesSpanOfString(sspan)
+}
+
 runAllTests()