Make llvm::StringRef to std::string conversions explicit.

This is how it should've been and brings it more in line with
std::string_view. There should be no functional change here.

This is mostly mechanical from a custom clang-tidy check, with a lot of
manual fixups. It uncovers a lot of minor inefficiencies.

This doesn't actually modify StringRef yet, I'll do that in a follow-up.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/unittests/Support/JSONTest.cpp b/llvm/unittests/Support/JSONTest.cpp
index 93efcf2..0357e21 100644
--- a/llvm/unittests/Support/JSONTest.cpp
+++ b/llvm/unittests/Support/JSONTest.cpp
@@ -196,7 +196,7 @@ TEST(JSONTest, ParseErrors) {
       FAIL() << "Parsed JSON >>> " << S << " <<< but wanted error: " << Msg;
     } else {
       handleAllErrors(E.takeError(), [S, Msg](const llvm::ErrorInfoBase &E) {
-        EXPECT_THAT(E.message(), testing::HasSubstr(Msg)) << S;
+        EXPECT_THAT(E.message(), testing::HasSubstr(std::string(Msg))) << S;
       });
     }
   };