Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -410,7 +410,10 @@
          Parent->isUnaryOperator() ||
          // FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
          Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
-         getBinOpPrecedence(Parent->Tok.getKind(), true, true) > prec::Unknown);
+         // for (auto && [A,B] : C)  && structure binding seen as ObjCMethodExpr
+         (Parent->isNot(tok::ampamp) &&
+          getBinOpPrecedence(Parent->Tok.getKind(), true, true) >
+              prec::Unknown));
     bool ColonFound = false;
 
     unsigned BindingIncrease = 1;
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -12926,6 +12926,9 @@
             guessLanguage("foo.h", "[[using gsl: suppress(\"type\")]];"));
   EXPECT_EQ(
       FormatStyle::LK_Cpp,
+      guessLanguage("foo.h", "for (auto &&[endpoint, stream] : streams_)"));
+  EXPECT_EQ(
+      FormatStyle::LK_Cpp,
       guessLanguage("foo.h",
                     "[[clang::callable_when(\"unconsumed\", \"unknown\")]]"));
   EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h", "[[foo::bar, ...]]"));