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from 190bb71b7c [clang] Fail for empty names in is*DerivedFrom matchers. new a6c6faa2b4 [clang] Remove IsDerivedFromDeathTest.DiesOnEmptyBaseName test. new 609d9a60a7 Implement P1771

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Summary of changes: include/clang/Basic/Attr.td | 9 +++- include/clang/Basic/AttrDocs.td | 27 ++++++++++ include/clang/Basic/DiagnosticSemaKinds.td | 6 +++ lib/AST/Expr.cpp | 20 +++++++- lib/Sema/SemaDeclAttr.cpp | 3 +- lib/Sema/SemaStmt.cpp | 59 ++++++++++++++++------ .../CXX/dcl.dcl/dcl.attr/dcl.attr.nodiscard/p2.cpp | 50 ++++++++++++++++++ test/Preprocessor/has_attribute.cpp | 2 +- unittests/ASTMatchers/ASTMatchersInternalTest.cpp | 7 --- www/cxx_status.html | 2 +- 10 files changed, 158 insertions(+), 27 deletions(-)