Make tooling::applyAllReplacements return llvm::Expected<string> instead of empty string to indicate potential error.

Summary:
return llvm::Expected<> to carry error status and error information.
This is the first step towards introducing "Error" into tooling::Replacements.

Reviewers: djasper, klimek

Subscribers: ioeric, klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D21601

llvm-svn: 275062

1 files changed, 3 insertions, 2 deletions

diff --git a/clang/unittests/Tooling/RewriterTest.cpp b/clang/unittests/Tooling/RewriterTest.cpp
index 93f69eb9fa0..e8afedb0117 100644
--- a/clang/unittests/Tooling/RewriterTest.cpp
+++ b/clang/unittests/Tooling/RewriterTest.cpp
@@ -41,8 +41,9 @@ TEST(Rewriter, AdjacentInsertAndDelete) {
   Replacements Replaces;
   Replaces.insert(Replacement("<file>", 6, 6, ""));
   Replaces.insert(Replacement("<file>", 6, 0, "replaced\n"));
-  EXPECT_EQ("line1\nreplaced\nline3\nline4",
-            applyAllReplacements("line1\nline2\nline3\nline4", Replaces));
+  auto Rewritten = applyAllReplacements("line1\nline2\nline3\nline4", Replaces);
+  EXPECT_TRUE(static_cast<bool>(Rewritten));
+  EXPECT_EQ("line1\nreplaced\nline3\nline4", *Rewritten);
 }
 
 } // end namespace