message: Fix unit test compilation failure.
diff: @@ -64,7 +64,8 @@ public:
  bool ResolveExact(StringRef Expr, SmallVectorImpl<char> &Output) override {
  Output.clear();
  - assert(!llvm::any_of(Expr, llvm::sys::path::is_separator));
  + assert(!llvm::any_of(
  + Expr, [](char c) { return llvm::sys::path::is_separator(c); }));
  assert(Expr.empty() || Expr[0] == '~');
  Expr = Expr.drop_front();
  if (Expr.empty()) {
  @@ -85,7 +86,8 @@ public:
  bool ResolvePartial(StringRef Expr, StringSet<> &Output) override {
  Output.clear();
  - assert(!llvm::any_of(Expr, llvm::sys::path::is_separator));
  + assert(!llvm::any_of(
  + Expr, [](char c) { return llvm::sys::path::is_separator(c); }));
  assert(Expr.empty() || Expr[0] == '~');
  Expr = Expr.drop_front();
  