[clang] [Format] Do not crash on non-null terminated strings (PR #131299)

[Ilya Biryukov via cfe-commits]

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@@ -29096,6 +29096,17 @@ TEST_F(FormatTest, BreakBeforeClassName) {
                "    ArenaSafeUniquePtr {};");
 }
 
+TEST_F(FormatTest, DoesNotCrashOnNonNullTerminatedStringRefs) {
+  llvm::StringRef TwoLines = "namespace foo {}\n"
+                             "namespace bar {}";
+  llvm::StringRef FirstLine =
+      TwoLines.take_until([](char c) { return c == '\n'; });
+
+  // The internal API used to crash when passed a non-null-terminated StringRef.
+  // Check this does not happen anymore.
+  verifyFormat(FirstLine);
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ilya-biryukov wrote:

Using it now, thanks.

https://github.com/llvm/llvm-project/pull/131299