add a test case for an invalid optimizatio

A recent optimization was overly aggressive and resulted in a miscompile in FoundationNetworking. Add a test case.
swiftlang · Sep 3, 2020 · cf8e32d · cf8e32d
1 parent 11f0f6e
commit cf8e32d
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diff --git a/test-foundation-package/test-foundation-networking-fetch.swift b/test-foundation-package/test-foundation-networking-fetch.swift
@@ -0,0 +1,6 @@
+import Foundation
+import FoundationNetworking
+
+let url = URL(string: "http://swift.org")!
+let data = try! Data(contentsOf: url)
+print(data.underestimatedCount)
diff --git a/test-foundation-package/test-foundation-networking-fetch.txt b/test-foundation-package/test-foundation-networking-fetch.txt
@@ -0,0 +1,8 @@
+REQUIRES: platform=Linux
+
+RUN: rm -rf %t
+RUN: mkdir -p %t
+RUN: %{swiftc}  -o %t/test-foundation-networking-fetch %S/test-foundation-networking-fetch.swift
+RUN: %t/test-foundation-networking-fetch | %{FileCheck} %s
+
+CHECK: {{[0-9]+}}